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The equation y -y1 = m(x-x1), m in R, re...

The equation `y -y_1 = m(x-x_1), m in R`, represents all lines through `(x_1,y_1)` except the line

A

`y=y_1`

B

`x=x_1`

C

`x+y=x_1+y_1`

D

none of these

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