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-2y=-x-4
y=2x-4
tegak lurus = M1*M2=-1
2*M2=-1
M2=-1/2
y-y1=m(x-x1)
y-(-5)=-1/2 (x-2)
(2)y+5=(2)-1/2x + 2
2y+10=-x+4
2y+x=4-10
2y+x=-6