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y-y1 / y2-y1 = x-x1 / x2-x1
y-5 / 2-5 = x-4 / -3-4
-7(y-5) = -3(x-4)
-7y+35 = -3x+12
3x-7y = 12-35
3x-7y = -23
1b.
y-y1 = m(x-x1)
y-5 = -2(x+2)
y-5 = -2x-4
y = -2x-4+5
y = -2x+1
2. (7,4) // 2x+5y-12 = 0
m1=m2=-a/b=-2/5
y-y1 = m(x-x1)
y-4 = -2/5(x-7)
y-4 = -2/5x + 14/5
y = -2/5x + 14/5 + 4
y = -2/5x + 34/5
5y = -2x + 34
2x+5y = 34