Answer y = -2
Step 1.
In order to make an equation with 1 variable, substitute the right side of the first equation for x in the second equation for 3x + 5y = 20. In the example all instances of x in the second equation will be replaced by 10.
Rewrite the x so it will be 3 · 10.
3 · 10 + 5y = 20
Step 2.
Multiply 3 by 10.
3 × 10 = 30
Step 3.
Subtract 30 from both sides.
30 + 5y - 30 = 20 - 30
Step 4.
Simplify.
5y = -10
Step 5.
Divide both sides by 5.
1. Divide the numbers.
5 ÷ 5 = 1
= y
2. Simplify. [tex]\frac{-10}{5}[/tex]
Apply the fraction rule. [tex]\frac{-x}{y} =-\frac{x}{y}[/tex]
[tex]-\frac{10}{5}[/tex]
3. Divide.
10 ÷ 5 = 2
Y = -2
If 3x-7=5x, what is 6x?
Answer:
6x = - 21
Step-by-step explanation:
Given
3x - 7 = 5x ( subtract 3x from both sides )
- 7 = 2x
Then
6x = 3 × 2x = 3 × - 7 = - 21
Water is building up in a bathtub. After 3 minutes there are 12 gallons of water and after 5, there are 24 gallons of water. What is the average rate which water is entering the bathtub from t=3 to t=5 minutes? What is the average rate? Show work.
Answer:
i think it's 15 gallons
the points (-15, -3) and (-7, -1) both lie on the graph of the linear function y =f(x). What is the rate of change of f(x) with respect to x?
F: 4
H: 1/4
G: -4
J: - 1/4
Answer:
Step-by-step explanation:
The rate of change, m, is defined as
m=(y2-y1)/(x2-x1), in this case we have points (-15,-3) and (-7,-1) so
m=(-1+3)/(-7+15)
m=2/8
m=1/4
if RG = 4X+12 and HI = 10x-15, then x =
The elevation of Houston,Texas is on average 614 feet above sea level. The elevation of Desert Shores, California is 61 feet below sea level. What is the difference in elevation between the two cities? Show your work.
Answer: 675ft
Step-by-step explanation: 614 + 61 (since it’s below sea level) =675ft
How do you know to which group an 8-year-old belongs, those
who must be accompanied by an adult or those who do not need
to be accompanied by an adult? Explain.
Answer:
Those who do not need to
Step-by-step explanation:
i would say this because they are old enoght to know how to do things by them self althought it does depend on who
I need help very fast please !
Answer:
Step-by-step explanation:
I like answer 3.... the series will add to 1/3 eventually
Answer:
Contents of this laser is 0.744 um and the mass of the earth
Write a equation that is equivalent that only uses addition
- 3x-8y-4-2
Answer:
Step-by-step explanation:
-3x - 8y - 2
what’s the value of e?
Answer:
e = 129
Step-by-step explanation:
The exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.
e is an exterior angle of the triangle , then
e = 60 + 69 = 129
Which expression is equivalent to -g-7+3g-6
a. - 4g - 13
b. - 8g - 3
c. -13 + 2g
d. - 4g - 1
Answer:
c. -13 + 2g is the correct option.
15203 + 10x2 - 183 – 12
O 3 (5.22 – 6) (2 – 2)
O (522 – 6) (3x + 2)
0 (52+ 6) (3x + 2)
o (582 – 6) (522 +2)
Answer:
the second one!
Step-by-step explanation:
math help-
Please help me answer the question below, I will give brainliest thing to whoever helps and gets it correct, thank you!
Answer:
y = 1/2 x + 5
Step-by-step explanation:
slope (m) = (y'-y) / (x'-x)
(y-6)/(x-2) = 1/2
y - 6 = 1/2 x - 1
y = 1/2 x + 5
If you wanna be Dora then please help me!
Liu is making a rabbit pen. The graph shows where he plans to place it in his backyard. Each unit on the graph represents 1 foot.
The length of the side between U and T is _______ feet.
Enter the number only.
Answer:
I think tge answer would be 24 I am not for sure
Help me plz :((( khan academy
Answer:
[tex]x=30\\[/tex]
Step-by-step explanation:
Answer:
x = 30
Step-by-step explanation:
[tex]\frac{45}{27} = 1.67\\[/tex]
1.67 x 18 = 30.06
round to the nearest whoeo number = 30
Find the product.
a.
5d - 79
b. 12 ab. 3cd
Answer:
35dg & 36abcd
Step-by-step explanation:
Multiply 7 times 5 then add the remaining terms for equation 1. For equation 2 multiply 12 by 3 for 36.
if f(x) =2x-6 then f(1)=
Answer:
f(1) = -4
Step-by-step explanation:
Given that,
f(x) = 2x-6
We need to find the value of f(1).
Put x = 1 in the above expression.
f(1) = 2(1)-6
= 2-6
= -4
So, the value of f(1) is equal to -4.
Points A and B have the same x-coordinates but opposite y-coordinates.
How many units away are each of the points from the y-axis?
A.3
B.4
C.6
D.7
Help me plzzzzzz!!!!!
London is working two summer jobs, making $7 per hour babysitting and making $13 per hour landscaping. In a given week, she can work no more than 14 total hours and must earn at least $130. Also, she must work at least 2 hours babysitting and no less than 8 hours landscaping. If xx represents the number of hours babysitting and yy represents the number of hours landscaping, write and solve a system of inequalities graphically and determine one possible solution.
Answer:
7,8,9,10
I HOPE ITS HELP
THANK YOU
how much is 48 from 12,5%
Answer:
6, but the question makes more sense when asking about 12.5% from 48
Step-by-step explanation:
to get a percentage of something, we just have to remember that [tex]X\% = \frac{X}{100}[/tex] and that we just need to multiply.
Yes, percentages are just numbers, but the percentage sign lets us signify the purpose of a number.
48 * 12.5% = 48 * 0.125 = 48 / 8 = 6
describe the vertical shift of Y=x^2-9
Answer:
ok so i dont know exactly what the answer is but this khan academy video will help just search.
describe the vertical shifted of y x 2 9 units
Okay I have reposted the question. Please help me ASAP
Answer:
angle 9
Step-by-step explanation:
A cylinder has a height of 4 yards. Its volume is 452.16 cubic yards. What is the radius of the cylinder?
Answer:
Step-by-step explanation:
V = π times r^2 times h (height)
452.16 = 3.14 times r^2 times 4
Multiply 3.14 times 4
452.16 = 12.56 times r^2
Divide 452.16 by 12.56.
452.16 / 12.56 = 36
36 = r^2
The square root of 36 is 6.
So the radius of the cylinder is 6 yards^3.
Honestly if anyone could help be understand how to solve these by factoring, that would be great! Thank you!
Answer:
1) Option 3
2) Option 3
3) Option 3
4) Option 1
5) Option 2
6) Option 3
7) Option 1
Step-by-step explanation:
1) [tex]y = x^2 + 4x + 3[/tex]
Lets split the middle term.
[tex]=> y = x^2 + 3x + x + 3[/tex]
[tex]=> y = x(x+3) + 1(x + 3)[/tex]
[tex]=> y = (x+1)(x+3)[/tex]
∴ [tex]x = -3 , -1[/tex]
2) [tex]y = 8x^2 - 22x + 5[/tex]
Lets split the middle term.
[tex]=> y = 8x^2 - 20x - 2x + 5[/tex]
[tex]=> y = 4x(2x - 5) - 1(2x - 5)[/tex]
[tex]=> y = (2x - 5)(4x - 1)[/tex]
∴ [tex]x =\frac{1}{4} , \frac{5}{2}[/tex]
3) [tex]y = x^2 - 5x[/tex]
[tex]=> y = x(x - 5)[/tex]
∴ [tex]x = 0 , 5[/tex]
4) [tex]y = 12x^2 + 18x[/tex]
[tex]=> y = 6x(2x + 3)[/tex]
∴ [tex]x = \frac{-3}{2} , 0[/tex]
5) [tex]y = x^2 - 7x + 12[/tex]
Lets split the middle term.
[tex]=> y = x^2 -3x - 4x + 12[/tex]
[tex]=> y = x(x - 3) - 4(x - 3)[/tex]
[tex]=> y = (x - 3)(x - 4)[/tex]
∴ [tex]x = 3,4[/tex]
6) [tex]y = 3x^2 + 10x + 8[/tex]
Lets split the middle term.
[tex]=> y = 3x^2 + 6x + 4x + 8[/tex]
[tex]=> y = 3x(x + 2) + 4(x + 2)[/tex]
[tex]=> y = (x + 2)(3x + 4)[/tex]
∴ [tex]x = -2 , \frac{-4}{3}[/tex]
7) [tex]y = x^2 - 4x - 45[/tex]
Lets split the middle term.
[tex]=> y = x^2 - 9x + 5x - 45[/tex]
[tex]=> y = x(x - 9) + 5(x - 9)[/tex]
[tex]=> y = (x - 9)(x + 5)[/tex]
∴ [tex]x = -5 , 9[/tex]
Find the value of x.
Answer:
x= 48
exterior angle theorem
-12+48 = 36
48x3= 144
36+134= 180
Choose the correct solution for the inequality:
-4x + 5 >-5
A: x < 2.5
B: X > 2.5
C: X <-2.5
D: X > -2.5
Answer:
A
Step-by-step explanation:
We have -4x > -10, so 4x < 10
Answer:
A. x < 2.5
Step-by-step explanation:
you subtract 5 on both sides
then you get -4x > -10.
then you divide -4 on both sides
and you get x<2.5
A family adopts a puppy that weighs 7 7/8 lbs. they take him to the vet 2 weeks later, and he weighs 12 3/16 pounds.How much weight did he gain.
Answer:
4.625 lbs or 4 5/8
Step-by-step explanation
12 3/16- 7 7/8=
Answer:
the answer is 4 and 5/16
Step-by-step explanation:
Help as soon as possible!!
Answer only if you know!
At least answer one of them!
Answer:
c) x=1.23
Step-by-step explanation:
a =3
b=2
c=-7
use quadratic equation where
[tex] { ax}^{2} + bx + c = 0 = \frac{ - b \: + or \: - \sqrt{ {b} ^{2} - 4ac} }{2a} [/tex]
-2+/- square root of (2^2- (4×3×-7) ) all that over 2x3
square root of (2^2-(4×3×-7) )
= 9.38083152
2×3=6
-2+or - 9.38 all that divided by 6
-2+9.38= 7.38÷6
x=1.23
or
-2-9.38 all divided by 6
-2-9.38= -11.38 ÷6
x= -1.9
all in all x can't be negative meaning x=1.23
For 5 months Tomas buys 4 boxes of crunchy granola bars and 3 boxes of chewy granola bars for his family.
Crunchy bars come in x bars and chewy granola bars come in y bars. Which two expressions can be used to
show the total number of granola bars Tomas buys.
x bars <4> and y bars come in <3>
Answer:
5(4x + 3y) = 20x + 15y
Step-by-step explanation:
The matter of months in which in this case is 5 months is the coefficient.
The amount of boxes per month is important information. We don't know how many bars are in each box. EACH is a key word for multiplying. If we want to know quickly how many bars are in 4 boxes (or 3) of the granola bars. We can simply multiply the amount of bars for each box with the amount of boxes. Since we don't know the amount of bars there are in each box we are going to use a variable. so it would look like this- 4x + 3y BUT we need to add the coefficient. Now rewrite the expression. 5(4x + 3y)
We can use the distributive property to generate an equal expression.
help help pls pls pls
Answer:
x = 13.6 in
Step-by-step explanation:
The arc x is calculated as
x = circumference of circle × fraction of circle
= 2πr × [tex]\frac{0.8}{2\pi }[/tex] ( cancel the 2π on numerator/ denominator )
= 17 × 0.8
= 13.6 in