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x1=2 y1=-4
X-5y=10
X=5y-10
Gradien m1=5
Rumus=m1.m2=-1
5xm2=-1
m2= -1/5
Rumus y-y1=m(x-x1)
y-(-4)= -1/5(x-2)
y+4= -1/5 + 2/5
y= -1/5 + 2/5 - 4
y= -1/5 - 4 2/5 ( jawaban nya)