Question

URGENT!!!

For the following system if you isolated X in the first equation to use the substitution method what expression would you substitute into the second equation?


-x-2y=-4

3x+y=12



A. -2y-4

B. 2y-4

C. 2y+4

D. -2y+4

Answer 1

Option (d) is correct.

Explanation:

The equations are :

-x-2y=-4 .....(1)

3x+y=12 ....(2)

Equation (1) can be rewritten as follow :

-x = -4+2y

x = 4-2y .....(3)

So, to solve the above systems of equations, we must substitute the value of x from equation (3) in equation (2). Hence, the correct option is (D).