m1 = -x/y
m1 = -4/-1
m1 = 4
m1 . m2 = -1
4 . m2 = -1
m2 = -1/4
y - y1 = m2 . (x - x1)
y + 2 = -1/4 (x - 1)
4y + 8 = -x + 1
x + 4y + 7 = 0
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m1 = -x/y
m1 = -4/-1
m1 = 4
m1 . m2 = -1
4 . m2 = -1
m2 = -1/4
y - y1 = m2 . (x - x1)
y + 2 = -1/4 (x - 1)
4y + 8 = -x + 1
x + 4y + 7 = 0