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5y=-2x
y=-2/5x
tegak lurus m1×m2=-1
⇔-2/5×m2=-1
⇔m2=5/2
y-y1=m(x-x1)
y-4=5/2(x-1)
y-4=5/2x-5/2 (kali 2)
2y-8=10x-10
2y=10x-10+8
2y=10x-2
y=5x-1
2x-5y=0 tegak lurus dengan y=5x-1