Question

Which step would be MOST useful in solving the system of equations by the substitution method?

A
subtract 8x from both sides in the second equation

B
add 5y to both sides in the first equation

С
divide the second equation by 7

D
multiply the first equation by 8

Answer 1

B. Add 5y to both sides in the first equation.

Explanation:

When we add 5y to both side in the first equation we will see that x = 22 + 5y

Then we can use this information in second equation like this:

-8(22+5y) + 7y = 22 which is a simpler equation and easier to solve.

So the answer to this question is B.