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(y-y1) / (y2-y1) = (x-x1) / (x2-x1)
(y-0) / (4) = (x)/3
y = 4/3 x
3. y = -1/4x + 15 (-8,a)
a = 2 + 15
a = 17
3b. 4x-3y+7 =0 (b,5)
4b -15+7 =0
4b = 8
b = 2
Nomor 2 dan 4 lanjutkan sendiri dengan rumus nomor 2a diatas.