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x=1 maka y= -1/2
diperoleh m = -1/4 karena tgak lurus shg m = -4
y = -4x-6
bx-ay=(bxI-ayI)
x-2y=4-(2.-2)
x-2y=4+4
x-2y=8
x-2y-8=0
good luck