Answer:
x = 1
y = -3
Explanation:
We will take our equation and substitute it, giving us:
6x - (-3x) = 9
Since there are two negatives We make it a positive. 6x + 3x = 9.
9x = 9
x = 1
Then we substitute, we will get 6 - y = 9.
6 = 9 + y
y = -3
We can now check this, substituting we get:
6 - (-3) = 9
6 + 3 = 9
Everything checks out.