Consider the equation $y-y_1=m(x-x_1)$. If $m$ and $x_1$ are fixed and different lines are drawn for different values of $y_1$, then
- Athe lines will pass through a fixed point
- Bthere will be a set of parallel lines
- Call lines intersect the line $x=x_1$
- Dall lines will be parallel to the line $y=x_1$
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