Answer:
x = 3 and y = 0 or (3, 0)
Explanation:
First, you use the first equation to find what y equals.
3x + y = 9
y = 9 - 3x
Next, you plug in y to the second equation.
2x - y = 6
2x - (9 - 3x) = 6
2x - 9 + 3x = 6
5x - 9 = 6
5x = 15
x = 3
Then, you plug in x in the first equation.
3x + y = 9
3(3) + y = 9
9 + y = 9
y = 0