Question

Please help If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to y from the first equation is substituted into the second equation.

8x - y = -9
4x - 3y = -22

Answer 1

The first step is to rewrite the first equation in terms of y
You can do this by adding y to both sides and adding 9 to both sides:
8x - y = -9 => y = 8x + 9

Now plug this value for y into the second equation

since you know that
4x - 3y = -22
and that
y = 8x + 9

you can say that

4x - 3(8x + 9) = -22

now you just have to simplify and solve