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garis l tegak lurus dengan k => m garis l= 1/4
y-y1=m(x-x1)
y-(-2)=1/4(x-4)
y+2=1/4x-1
y=1/4x-1-2
(y=1/4x-3)x4= 4y=x-12 (A)
11. y1-y2/x1-x2= 8-0/0+4= 2