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pakai :
(y-y1)/(y2-y1) = (x-x1)/(x2-x1)
(y-0)/(4-0)=(x-2)/(0-2)
y/4=(x-2)/-2
kali silang
-2y=4(x-2)
kedua ruas dibagi 2
-y=2(x-2)
-y=2x-4
pindah ruas y dan 4
jadi
y+2x=4 (A)