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-5y=-2x+8
y=-2x+8/-5
sehingga m1=2/5
syarat grs yg sjajar m1 =m2
jdi pers grsnya melalui m=2/5 dan titik (7,2)
y-y1=m(x-x1)
y-2=2/5(x-7)
y-2=2/5x-14/5
y=2/5x-14/5+2
y=2/5x-14/5+10/5
y=2/5x-4/5
atau 5y=2x-4