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2y = 1-x
y = 1/2-1/2x, gradiennya -1/2
misalkan gradien garis yg baru adalah m, karena tegak lurus, maka:
m.-1/2 = -1
m = 2
y-y1 = m(x-x1)
y-3 = 2(x+1)
y-3 = 2x+2
y-2x-3-2 = 0
y-2x-5 = 0