Respuesta :
You already have your Y value so just substitute 9 in for y in the other equation and solve for x.
y = -3x + 6
y = 9
9 = -3x + 6
Subtract 6 from both sides
3 = -3x
Divide both sides by -3
-1 = x
(-1,9)
y = 9
9 = -3x + 6
Subtract 6 from both sides
3 = -3x
Divide both sides by -3
-1 = x
(-1,9)