Question

Select the choice below that could be the first step in solving the following system of equations using substitution:
-x + 4y − 9 = 0
3x − 5y = 10

A) Replace the right side of the second equation with the first equation
B) Multiply the first equation by 3
C) Multiply the second equation by 4
D)Write the first equation in terms of x

Answer 1

answer d

you would write x = 4y - 9

and then substitute into equation 2

Answer 2

D is the correct answer.

There is no reason to do A, B, or C.

Answer 3

It becomes so easy to solve these equations if we eliminate x in the first equation and substitute its value in second equation..

So we will find x from the first equation first....

Answer D is the correct one...