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3y+15=2(x-3)
3y+15=2x-6
2x-3y=21
dengan :
m = gradien
C = konstanta
(x,y) = (3, -5) <=> x = 3 dan y = -5
m = 2/3
substitusikan ke pers. umum, didapatkan
y = mx + c
-5 = 2/3 . 3 + c
-5 = 2 + C
C = -7
y = mx + c
y = 2/3 x + (-7)
y = 2/3 x - 7 | x3
3y = 2x - 21
2x-3y=21