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_____ _______
-1 - (-4) 3 - (-12)
y + 4 = x + 12
____ _____
-1 + 4 3 + 12
y + 4 = x + 12
____ ______
3 15
15(y + 4) = 3(x + 12)
15y +60 = 3x + 36
15y = 3x + 36 - 60
15y = 3x - 34
15y -3x + 34 = 0