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Since there is only one linear equation in two unknown variables, it cannot be solved further. The coordinates of any of the infinitely many points on the line given by the equation: y = x - 7 are a solution.
-y + y equals 0.
For y - 2y - 3y equals 0, y equals 0.
y - 3 = 0 y = 3
y = -6
-3
b = y - mx.
y= -2x
y=x+4
y=5-x
16
y = mx + b
2y = 4 (divide both sides by 2 to solve) y = 2