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(y-y1)(x2-x1)=(x-x1)(y2-y1)
a)A=(-4,-2) B=(4,2)
(y +2)(4 + 4) = (x+4)(2+2)
8y + 16 = 4x + 16
y = 1/2 x
b)B=(4,2) C=(-1,4)
(y - 2)(-1-4) = (x-4)(4-2)
-5y +10 = 2x - 8
-5y = 2x - 18 / : -5
y = -2/5 x + 3 3/5
c)C=(-1,4) A=(-4,-2)
(y-4)(-4+1)=(x+1)(-2-4)
-3y + 12 = -6x - 6
- 3y = -6x - 18
y = 2x + 6