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(y+4)/(0+4) = (x+3)/(0+3)
(y + 4) / 4 = (x + 3) / 3
3(y + 4) = 4(x + 3)
3y + 12 = 4x + 12
3y - 4x = 12 - 12
3y - 4x = 0
b) y = m(x - x1) + y1
y = -2(x - 0) + 0
y = -2x
c) y = m(x - x1) + y1
y = ⅓(x - 4) + 0
y = ⅓x - 4/3 ---> ×3
3y - x = -4