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M1 = -a/b
= -2/1
= -2
Trus persamaan garis yg sejajar dengan l
M1=M2
=-2
Y-y1 = m(x-x1)
Y-3 = -2(x-4)
Y-3 = -2x+8
Y = -2x+8+3
Y= -2x+11
Kalo yg tegak lurus itu gw gatau kal,,