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-9(y-7) = -5(x-5)
-9y+63 = -5x+25
-9y = -5x+25-63
-9y = -5x-38
no 2
m1 =
m1 =
m1 =
m1 =
m1 = 3
m2 = m1
m2 = 3
y-y1 = m2(x-x1)
y-9 = 3(x-7)
y-9 = 3x - 21
y = 3x - 21 + 9
y = 3x - 12