y-1=-1/2(x-2)

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Solution for y-1=-1/2(x-2) equation: 


x in (-oo:+oo)

y-1 = (-1/2)*(x-2) // - (-1/2)*(x-2)

y-((-1/2)*(x-2))-1 = 0

(1/2)*(x-2)+y-1 = 0

1/2*(x-2)+y-1 = 0

1/2*(x-2)+y-1 = 0

1/2*x+y-1-1 = 0

1/2*x+y-2 = 0

1/2*x+y-2 = 0

1/2*x+y-2 = 0 // - y-2

1/2*x = -(y-2) // : 1/2

x = (-(y-2))/1/2

x = 2*(2-y)

x = 2*(2-y)

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