Answer:
(-1,9)
Explanation:
y=-3x + 6
y = 9
We know that y=9
Substitute that into the first equation
9 = -3x+6
Subtract 6 from each side
9-6 = -3x+6-6
3 = -3x
Divide by -3
3/-3 =-3x/3
-1 =x
x=-1, y=9
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