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x=3
y=6
m = 1/2
rumus :
y=mx+c
y=1/2.x+c
6=1/2.3+c
6=3/2+c
c=6-3/2
c=9/2 = 4,5
y=1/2.x+9/2
y-6 = 1/2(x-3)
y-6 = 1/2x -3/2 -------> ke 2 ruas di kali 2
2y-12= x-3 -----> 12 pindah ruas
2y = x- 3 + 12
2y = x-9
maaf kalau salah