-6
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There is no single answer for the equation: each value of x gives a different value of y and, in the Cartesian plane, all these pairs of (x,y) lie on a line defined by the equation 3x - y = 9 or y = 3x - 9
3x-6y=9 -3x -3x -6y=9-3x __ ____ -6 -6 y=9-3x ____ -6
3x-y = 9 2x+y = 6 Add both equations together: 5x = 15 x = 3 and y = 0
-3x - 9 = 3y -x - 3 = y y = -(x+3)
9
y=-2/3x