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y1 = 1
m = 3
y - y1 = m ( x - x1 )
y -1 = 3 ( x - (-2) )
y - 1 = 3 ( x + 2 )
y - 1 = 3x + 6
y = 3x + 7
y - 1 = 3(x - (-2))
y - 1 = 3x + 6
y = 3x + 6 + 1
y = 3x + 7 atau x - y + 7 = 0