-4x +7y=26;4x+7y=2
pls help​

Answer:

x = 3

x = -3 + √ 10

x = -3 - √ 10

Step-by-step explanation:

I used a calculator

** I'm not sure if the x's are multiplication symbols or they're variables. (I'm assuming they're variables).

If it's wrong, I'm sorry!!

Step-by-step explanation:

a=2

b=-7

c=-15

-(-7)+-sq root (-7)²-4(2)(-15) / 2(2)

7 +- sq root 169 / 4

7+- 13 / 4

7+13 / 4, 7-13 / 4

x=5 x=-3/2

Answer:

560

Step-by-step explanation:

Answer:

first add 3 to both sides to get rid of the three on the left side

2x = 4

then divide 2 from both sides since it is the opposite of the operation shown then you'll get x = 2 when dividing to on the left side you get rid of it because you are trying to get rid of as much of the numbers as possible.

Answer:

X=2

Step-by-step explanation:

1). cancel the -3 out on both sides of the equation

2). When you add together the 1 and 3, you will recieve the value of 4

3).In order to get the x attached to the coefficient 2 isolated you have to divide 2 on both sides

4.) 2x = 4

5). 2x/2 = x

6). 4/2 = 2

Therefore x=2

Step-by-step explanation:

Please refer to the attachment

Answer:

Step-by-step explanation:

A: Transitive

B: Also transitive

C: Reflexive

D: Addition Property of Equality

Hope it helped! There are resources online that you can use to see all of the theorems for geometry.

Answer:

y = 45 / 2x + 50

Step-by-step explanation:

The best equation for the line of the best fit would be y = 45 / 2x + 50.

The slope would be 45 / 2 and the y-intercept would be ( 0 , 50 ).

I used the points, ( 0 , 50 ) and ( 4 , 140 ) to get the equation, slope, and the y-intercept.

I used those points because they were the most accurate ones that I know for now.

Also, remember the formula is, "y = mx + b."

77

28 / 7 = 4

28 = 4/7 or 4 x 7

x = 7/7 or 7x7

so x would equal 49

28 + 49 = 77

Answer:

216mx meters

Step-by-step explanation:

m is in minutes so convert it in hours = 60m hrs

Speed is in metres per second, convert it in kilometers per hour= 18x/5

Now we’ve time and speed, put it in the formula

Distance = speed x time

= 18x/5 x 60m

= 216mx meters

Hope it helps

Answer:

B

Step-by-step explanation:

The distance between point x and y

Answer:

83%

Step-by-step explanation:

No. of questions answered correctly = 166

Total no. of questions = 200

Percentage of questions answered correctly = (166/200)*100 = 83%

Step-by-step explanation:

The Rule: If you are multiplying by a value less than one, your product will decrease. If you are multiplying by 1, the product will be equal and if you are multiplying by a value greater than 1, the product will increase.

Answer:

2 x  − 6

Explanation:

"Six less than.." means "Subtract 6 from".

Do not confuse this with "Six less..." which means "Subtract from 6".

Confusing, I know.

We know that "Double a number" means  

2 x , where  x  is your mystery number.

Therefore, we have:

2 x  −  6 , which translates to "6 less than 2x" or "6 less than twice a number"

Answer:

l×b×h

5m × 4m × 10m

 200m^3

Step-by-step explanation:

Volume of the figure

[tex] = 10 \times 5 \times 4[/tex]

[tex] = 200m {}^{3} [/tex]

Answer:

f(x) = -1/x+5  +2

Step-by-step explanation:

Answer:

C = 35

Step-by-step explanation:

C/7 = 5

multiply both sides of the equation by 7:

C = 35

Answer:

The number of faces is 7.

The surface area is : 278 cm2

Step-by-step explanation:

below: 7x10=70cm2

up: 3x10=30cm2

behind: 5x10=50cm2

front: 2x10+5x10=70cm2

right: 2x7+3x3+4x3/2=29cm2

left: 29cm2

Answer:

surface area =

(2×10) + (5×10) + (3×10) + (5×10) + 2((7+3)×3) +2(2×7)

Answer:

15%

Step-by-step explanation: maybe

Answer:

6m

Step-by-step explanation:

Jjsjsjjs

Answer:

You could put a set of parentheses around [tex]8^{2}[/tex] ÷ [tex]4[/tex]

Step-by-step explanation:

I hope this helps!

Answer:

192 square feet

Answer:

368

Step-by-step explanation:

Answer:

y = x - 2

Step-by-step explanation:

Find the slope using rise over run

(y2 - y1) / (x2 - x1)

Plug in the points:

(y2 - y1) / (x2 - x1)

(-5 - 4) / (-3 - 6)

-9 / -9

= 1

Using y = mx + b, plug in the slope and a point to solve for b:

y = mx + b

4 = 1(6) + b

4 = 6 + b

-2 = b

Plug in the slope and b to y = mx + b

y = 1x - 2

y = x - 2

So, the equation of the line is y = x - 2

Answer:

24 tickets would cost about $55.92

Step-by-step explanation:

To solve this equation I decided to figure out how much one ticket cost. I divided 7 by 3 and got 2.333333 I rounded that to one ticket costing $2.33. I then multiplied 2.33 by 24. 24 x 2.33= 55.92.

The reason I multiplied 24 by 2.33 is because the cost of one ticket is $2.33 so if I wanted to buy 24 tickets, I would have to multiply in order to find out the total cost.

I hope that this answer helped :D

Answer:

24 tickets would cost $56

Step-by-step explanation:

You would Convert it to a decimal by dividing the numerator by  the denominator. 7/3*24=$56

3 tickets cost=$7

1 ticket cost= 7/3=$7/3

Answer:

C. 13

Step-by-step explanation:

Apply pythagorean theorem.

Thus:

Diagonal AV = √(12² + 5²)

AV = √(144 + 25)

AV = √169

AV = 13 cm

It's A. B doesn't really make sense ("derivative of the differential equation" is somewhat nonsensical, "derivative of an equation" is not meaningful).

More to the point: Slope fields are used to visualize solutions to differential equations of the form

y' = f(x, y)

You take some point (x, y) and evaluate y' at the point. This gives the slope of the line tangent to the particular solution to the DE that passes through the point (x, y ).

Sample several points and evaluate y' at those points and you get several different slopes.

Simple example:

y' = x ² - y ² = (x + y ) (x - y )

Let's take the points (1, 1), (-1, 0), and (2, -2), at which we get slopes

y' = f (1, 1) = 0

y' = f (-1, 0) = 1

y' = f (2, -2) = 0

From here, you can get particular solutions that pass through a certain point by interpolating the slopes of the tangents to the solution. I've attached a slope field for the example here at the points listed above. (In the order red, green, black). Each light gray arrow in the background shows the slope of the tangent line.

If you're still unsure how the slope field is generated, I suggest looking up videos on the subject. The process is a bit difficult to describe without a dynamic visual aid.

Answer:

He made $51.25

Step-by-step explanation:

550+65=615

12% of 615 is 51.25 so your answer is 51.25

Answer:

it takes the bears 12 days to eat honey together.

Step-by-step explanation:

1/x+9+1/x+16=1/x

(solve this using cross multiplication)

= x^2 = 144

x=12

The number of days that it takes for both of the considered bears to eat a barrel of honey together is 12 days.

More people to do a task means less time it will take.

Less people to do a task means more time it will take.

Thus, they are inversely related.

We can define a constant as "Manpower" needed for doing that specific work.

Each worker has his/her own strength. That strength is applied per unit of time.

Let we define:

Manpower needed for a work = time taken for that work  × strength used for that work per unit of time

(we used multiplication as it represents linear use of strength to finish the task, so using that strength for a finite units of time means you stacked up your strengths that many times to finish that work)

Here, we have:

Assume that:

Then, we get:

Manpower needed for a work = time taken for that work  × strength used for that work per unit of time

[tex]M = x \times S\\M = y \times T[/tex]

If bear A and bear B both do the work together, then their strenghts will add up.

That means, the combined strength would be S + T per day

The manpower the work needs is still M, therefore, the time needed is:

[tex]M = \text{Time needed} \times (S + T)\\\\\text{Time needed} = \dfrac{M}{S+T}[/tex]

This is the time needed for both bears to do the work together.

Also, it is given that:

It takes a bear 9 more days to eat a barrel of honey alone than it takes the bear and a second bear to eat the barrel of honey together.

or

Time needed by bear A to do work = 9 + time needed by both bears to do the work

or

[tex]x = 9 + \dfrac{M}{S + T}[/tex]

Also, it is given that:

It takes the first bear 7 fewer days to eat a barrel of honey alone than it takes the second bear to eat a barrel of honey alone.

or

Time taken by bear A to do the work = Time taken by bear B for that work - 7 days

or

[tex]x = y - 7[/tex]

Thus, we got these equations:

[tex]M = S \times x\\M = T \times y\\\\x = \dfrac{M}{S + T} +9\\\\x = y - 7[/tex]

call them first, second, third and fourth equation as per their ordering.

From the first and second equation, we get:

[tex]S = \dfrac{M}{x}\\\\T = \dfrac{M}{y}[/tex]

Putting these values in the third equation, we get:

[tex]x = \dfrac{M}{M/x + M/y} + 9\\\\\\x = \dfrac{xy}{x+y} + 9\\\\(x-9)(x+y) = xy\\x^2 -9x -9y + xy = xy\\x^2 -9x = 9y[/tex]

From the fourth equation, we know that:

[tex]x = y - 7[/tex]

or [tex]y = x +7[/tex]

Putting this value of y in the  equation [tex]x^2 -9x = 9y[/tex], we get:
[tex]x^2 -9x = 9(x+7)\\x^2 -9x = 9x + 63\\x^2 -18x -63 =0\\\\x^2 -21x + 3x -63 = 0\\x(x-21) + 3(x - 21) = 0\\(x+3)(x-21) = 0\\(x+3) = 0, (x-21) = 0\\x = -3, x = 21[/tex]

'x' represents time in number of days. So it cannot be negative.

Thus, the value of x obtained is 21.

Also, we need: Time needed for both the bears to do the work together.

This time is the value of [tex]\dfrac{M}{S+T}[/tex], which is equal to [tex]x - 9[/tex] days (from the third equation)

Thus, the time needed  for both the bears to do the work together = [tex]x-9 = 21-9 = 12 \; \rm days[/tex]

Thus, the number of days that it takes for both of the considered bears to eat a barrel of honey together is 12 days.

Learn more about work and time here:

https://brainly.com/question/1063042

#SPJ2

Answer:

y = x + 2

Step-by-step explanation: