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y-y1=m (x-x1)
y-9=4/5(x-4)
y-9=4/5x-16/5
y=4/5x-16/5+9➡-16/5+9/1=-16/5+45/5=29/5
y=4/5x+29/5(semua dikali 5)
5y=4x+29
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