Which of these strategies would eliminate a variable in the system of equations? -x+6y=8
7x -y = -2

Choose all answers that apply:

(Choice A)
A Multiply the bottom equation by 6, then subtract the bottom equation from the top equation.

(Choice B)
B Add the equations.

(Choice C)
C Multiply the top equation by 7, then add the equations.

B) Subtract the bottom equation from the top equation

C) Add the equations.

Step-by-step explanation:

We have to eliminate a variable in the system of equations

6x + 5y = 1 . (1) and  

6x - 5y = 7  (2)  and,

Since the y-term on both the equations are the same but opposite in sign, therefore the strategy to eliminate y variable from the system of equations (1) and (2) is to add the equations. (Answer)

Again, the x-terms are the same and with a similar sign, therefore, by subtracting the bottom equation from the top equation we can also eliminate the x-variable. (Answer)

Step-by-step explanation:

Multiply the top equation by 7, then add the equations.

Step-by-step explanation:

I just did it Khan Academy.

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you

the 2 figures are congruent bc if you reflect abcd over the y axis then over the d axis the figures overlap