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m1 = -2
m1xm2 = -1
m2 = 1/2
y-y1 = m(X-X1)
y-1 = 1/2(X-1)
y-1 = 1/2X -1/2
2y-2 = X-1
dipindah-pindah:
X-2y+1 = 0
jawabannya yang A
Semoga membantu :D