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m1=2
m1*m2=-1
m2=-1/2
m2=-0.5
y-y1 = m(x-x1)
y-(-7)=-0.5(x-2)
y+7= -0.5x + 1
y = -0.5x - 6 ...(kalikan 2)
2y = -x - 12
x + 2y + 12 = 0