Question

solve the substitution method
5x-9y=-15
3x+31=y

Answer 1

Substitute the second eqn (already equal to y) into the first:

5x - 9 * (3x + 31) = -15
5x - 27x - 279 = -15
-22x = 264
x = -12

Now, substitute x back into second equation:

3 * (-12) + 31 = y
-36 + 31 = y
y = -5

Answer 2

so how do i get my answer?

Answer 3

I would assume the answer needed was the x and y values: x=-12 and y=-5. You asked to solve by substitution, which the work shows.

Answer 4

so how would i type it as a ordered pair?

Answer 5

An ordered pair is just (x, y), so this problem would be (-12, -5).