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= -3/5
y-y1= m(x-x1)
y-3=-3/5(x-2)
5y-15=-3x+6
3x+5y=6+15
3x+5y=21
5y=-3x+15
y=-3/5 x + 3
m1 = -3/5
// m2 ⇒ m1 = m2
m2 = -3/5
y-3 =-3/5 (x-2)
5(y-3) = -3x+6
5y-15 = -3x+6
5y+3x-21 = 0