Solve the simultaneous equations by substitution
2x+7y=5
x+y=5
Answers
Answer:
x = 6
y = -1
Step-by-step explanation:
i solved the second equation for 'y' to get 'y = 5 - x'
now i substituted that expression into the first equation for 'y'
2x + 7(5 - x) = 5
2x + 35 - 7x = 5
-5x = -30
x = 6
find 'y':
6 + y = 5
y = 5 - 6
y = -1
y=-1 and x=6
followed by the substitution method
Related Questions
Help me plzzz T^T and It's a multiple choice
Homework: Compound Probability Without Replacement
A cooler contains ten bottles of sports drink: four lemon-lime flavored, three orange flavored, and three fruit-punch flavored. You randomly grab a bottle for your coach, a bottle for your friend, and a bottle for yourself. Your coach and your friend get orange. You get a fruit-punch.
1/5, 1/4, 1/40, 25/546
Answers
Answer: B
Step-by-step explanation: Im Sorry if Im Incorrect Thats What I Think It Is :)
Answer:
I think Option A is your answer ☺️☺️☺️
Liz is watching a film at the cinema.
The film started at 1430
The film is 105 minutes long.
When the film ends, Liz takes 20 minutes to get to the bus stop.
A bus leaves the bus stop at 1645
Does Liz get to the bus stop in time to get this bus?
You must show all your working.
Answers
Answer:
Yes, she does
Step-by-step explanation:
105min=1h 45min
14h 30min + 1h 45min= 16h 15min
16h 15min + 0h 20min=16h 35min
16h 45min - 16h 35min= 10min
So, the answer is yes, she does and she still has 10 minutes free.
0.3 x 103
0 3 x 1025
Write the following as an ordinary number. [
(1 Point
3x10
Answers
0.3 x 1025 = 307.5
3 x 10^5 = 300,000
There are 42 more red marbles in a jar than there are white marbles. If there are 238 marbles in the jar, how many of them are red and how many are white?
Answers
Answer:
Red: 161 White: 77
Step-by-step explanation:
Given there are 238 marbles in a jar, and there are 42 more red marbles than white marbles, we need to divide the number of marbles by two, as there are, presumably, two colors.
238 / 2 = 119
After doing this, we subtract 42 from one of the two 119s, and we add 42 to the other.
119 - 42 = 77
119 + 42 = 161
The value with 42 added is the red marble count, and the value with 42 subtracted is the white marble count.
Hi! Please let me know if you would like to trade a 5$ microsoft giftcard in exchange for a 10$ sephora one. I am 4.78 short and I would be willing to trade my 10$ sephora gift card for one.
Answers
Answer:
HAHHAHAH XD sorry jkjkjk
Step-by-step explanation:
I really really need your help!!
Answers
Answer:
1.) 1/2x = 32
2.) 3x = 18
3.) x/7 = 4
4.) 5m=105
divide both sides by 5
m= 21
5.) -2c=-32
divide both sides by -2
c=16
6.) x/4=-44
multiply both sides by 4
x=-176
7.) s/-3 = -21
multiply both sides by -3
s=63
2. 6
3. 28
4. M=21
5. C=16
6. X=-176
7. S=63
for a walk-a-thon a sponsor committed to give to give you a flat fee of $5 plus $2 for every Mile you walk write an expression for the total amount you collected from the sponsor at the end of The Walking on expression
Answers
how do you do this question? 再20至30之间，有多少个质数？A .2 B.4 C.6 D.8
Answers
Answer:
有两个，是23 和29
所以是 A
Sam had a bank account balance of $-\$32$ . He deposited $\$28$ into his account.
Which statement is true about his balance after making the deposit?
Answers
Answer:
After making the deposit, he/she still has a bank account of -4 dollars.
Step-by-step explanation:
The volume of the right prism is 360 cm. What is the surface area of the prism, in square centimeters? Record your answer on the grid. Then fill in the bubbles. 9 cm 15 cm
Answers
Answer:
135 cm
Step-by-step explanation:
Click on the greatest measure of length.
A) 30,000
B) 1 kilometer
C) 6,000 centimeters
D) 5,000 Meters
Answers
Answer:
D
Step-by-step explanation:
30000mm = 30m
1km = 1000m
6000cm = 60m
and 5000m
HELPP *20 points*
Christof walks 2.5 kilometers to the library. He knows that 5 kilometers is approximately 3.1 miles. How many miles, rounded to the nearest hundredth, does Christof walk to the library?
Answers
Answer:
the answer for this problem should be half of 3.1 sense 2.5 is half of 5 so split 3.1 in have to get 1.55. hope this helps.
The number of miles that is equal to 2.5 km will be 1.55 miles.
What are ratios and proportions?A ratio is an ordered set of integers a and b expressed as a/b, with b never equaling 0. A proportional is a mathematical expression in which two things are equal.
Christof walks 2.5 kilometers to the library. He knows that 5 kilometers are approximately 3.1 miles.
Then we have
Let x be the number of miles that is equal to 2.5 km. Then we get
x/2.5 = 3.1/5
x = 1.55 miles
More about the ratio and the proportion link is given below.
https://brainly.com/question/14335762
#SPJ2
The symbol _____________ means "is similar to" and the symbol ____________ is the abbreviation for the word angle.
Answers
Answer:The symbol \sim∼ means "is similar to" and the symbol \angle∠ is the abbreviation for the word
angle.
Step-by-step explanation: i hope it is right i am sure it is
The symbol "[tex]{\sim}[/tex]" is commonly used to represent the mathematical concept of "is similar to." while "∠" represents the concept of an angle.
The symbol "[tex]{\sim}[/tex]" is commonly used to represent the mathematical concept of "is similar to." often used in mathematical equations or geometric diagrams to indicate the presence of a similarity.
On the other hand, the symbol "∠" is the abbreviation for the word "angle." In geometry, an angle is formed when two rays or line segments share a common endpoint.
Thus, the symbol "[tex]{\sim}[/tex]" is commonly used to represent the mathematical concept of "is similar to." while "∠" represents the concept of an angle.
Learn more about similarities here:
brainly.com/question/25882965
#SPJ4
If a<b and c<b, then a<c. True or False
Answers
Answer:
False
Step-by-step explanation:
should be false
A couple took out a $5,000 loan from the bank. The loan had a simple interest rate of 7.5% per year. By the end of the loan, the couple had paid $2,250
interest.
What was the length of the couple's loan?
Answers
Answer:
6 years
Step-by-step explanation:
t=2250/375
t=6
Hence time of the loan will be 6 years
Answer:
6 years
Step-by-step explanation:
5000 x 0.075 = 375
2250/375 = 6
therfore it is 6 years worth of interest
1/2 (12n-3)=14-10n
please help solve the value of n and show work!
Answers
Answer:
n = 31/32
Step-by-step explanation:
Hope I was able to help:))
Find a polynomial function whose graph passes through (7,11), (10,-11), and (0,3)
Answers
Answer:
there right
Step-by-step explanation:
Answer:
Step-by-step explanation:
The shirt was doubly marked down! There was a 25% off sale, and then an additional 10% off of that. After the mark downs, the price was $30. Which equation shows the original price of the shirt? Use S to represent original price of shirt.
Answers
Answer:
40.5
Step-by-step explanation:
i multiplied 30 with .25 which was 7.5
then i multiplied 30 with .1 which was 3
add those together 10.5
add that too 30 which is 40.5
1. What is the ratio of cow to ducks? (2 marks)
Plz help me
Answers
Answer:
i guess 10 i hope this is the right answer
Answer:
Step-by-step explanation:
its 1 : 4
Can someone please do this problem
Answers
Answer: 250
Step-by-step explanation:
5/1250
5 divided by 1 is 0, because 5 cannot go into 1
bring the 2 down.
5 divided by 12 is 2, 2 times 5 is 10, 12 minus 10 is 2
bring the 5 down.
5 divided by 25 is 5, 5 times 5 is 25,
bring the zero down.
5 divided by 0 is 0, 5 cannot go into 0.
what is the value of X enter your answer in the box
Answers
Answer:
Step-by-step explanation:
Set up the following ratio which applies to all angle bisectors and the side opposite.
8 / (x + 4) = 12 / (2x + 1) Cross multiply
8 * (2x + 1) = 12 * (x + 4)
16x + 8 = 12x + 48 Subtract 8 from both sides
16x + 8 -8 = 12x + 48-8
16x = 12x + 40 Subtract 12x from both sides
16x - 12x = 40
4x = 40 Divide by 4
4x/4 = 40/4
x = 10
Mina tiene \dfrac{4}{5} 5 4 start fraction, 4, divided by, 5, end fraction de la harina necesaria para hacer una hogaza. Se necesita la misma cantidad de harina para hacer 111 hogaza que para hacer 121212 panes. ¿Cuál es el mayor número de panes que Mina puede hacer con la harina que tiene?
Answers
Answer:
El mayor número de panes que Mina puede hacer con la harina que tiene es 9 torrejas de pan.
Step-by-step explanation:
Una hogaza equivale a 12 torrejas de pan, si Mina tiene [tex]\frac{4}{5}[/tex] de la harina necesaria para preparar una hogaza. Entonces, el número total de torrejas es [tex]\frac{4}{5}[/tex] de 12 torrejas de pan. Es decir,
[tex]x = \frac{4}{5}\times 12[/tex]
[tex]x = 9.6[/tex]
Puesto que la cantidad de hogazas en un número entero, se trunca al entero más cercano. En consecuencia, el mayor número de panes que Mina puede hacer con la harina que tiene es 9 torrejas de pan.
1. Find the GCF for 14ab- 42a
Answers
Answer:
14(ab- 3a)
Step-by-step explanation:
14 times ab is 14ab and 14 times 3a is 42a
Here is an expression: 3⋅2 Evaluate the expression when is 1. Evaluate the expression when is 4.
Answers
Answer:
1.) 5
2.) 14
Step-by-step explanation:
As given,
the expression - 3x + 2
1.)
Evaluate the expression when x is 1
⇒ 3x + 2 = 3(1) + 2 = 3+2 = 5
2.)
Evaluate the expression when x is 4
⇒ 3x + 2 = 3(4) + 2 = 12+2 = 14
A group of four friends goes to a restaurant. They all order a burger that cost b and fries for $1.39. One friend also gets dessert for $2.49. Their total is $28.01. Write an equation can be used to find the cost of one burger. *
Answers
Solve the two-step equation.
21 27
4 4
DC-
Answers
Answer:
Step-by-step explanation:
-2x/3-21/4=27/4, add 21/4 to both sides
-2x/3=12, multiply both sides by -3/2
x=-18
plz answer only if u know ur correct
Answers
Answer:
blue, y=150x
Step-by-step explanation:
x increased by 2 and y increased by 300 so y=150x
Answer:
Y=150x, blue, diamond, yeah
Step-by-step explanation:
On the orange line, x is increased by 2 and y is increased by 300. In this case, y = 150 times x. So y=150x. I hope this helped and I'm not really sure how else to explain it.
Can someone please tell me how to expand and simplify 4(x+1)^2?
[ i know now to expand brackets like (x+2)^2, but the 4 confuses me]
Answers
Expand the binomial first, then distribute the 4:
4 (x + 1)² = 4 (x ² + 2x + 1)
… = 4•x ² + 4•2x + 4•1
… = 4x ² + 8x + 4
sally writes 450 words in half an hour how many words would she write in 7 minutes
i just gotta confirm if my answer is right
Answers
Answer:
time= half hour= 30 min
words = 450
number of words in 30 min= 450
number of words in 1 min= 450/30
number of words in 7 min = 450/30 x 7
= 105 words
Step-by-step explanation:
find the area of quadrilateral which all side is 4 cm and diagonal one is 7 and diagonal two is 6
Answers
Step-by-step explanation:
Your answer...... 21 cm^2
WANT MORE THEN FOLLOW ME, LIKE & MARK MY ANSWER AS BRAINLIST ANSWER
Answer:
the quadrilateral is a rhombus as its all four sides are equal (of 4cm) each
Area of rhombus = 1/2 (digonal 1 × digonal 2)
= 1/2 ( 7×6 )
= 1/2 ( 42)
= 21
hence area of quadrilateral is 21 cm square