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per
x2-x1
= 1-3
per
-4 - 2
= -2/-6
=1/3
setelah itu kali silang maka,
-2(y - 3) = -2(x - 2)
-2y + 6 = -2x + 4
-2y = -2x + 4 - 6
-2y = -2x - 2 (kedua ruas dibagi -2)
y = x
Ada yang salah dilakan dikomentar(: