Question

Find the equation of the line which passes though (0, 0) with slope m.

Answer 1

We know that the equation of the line passing through point $(x_0,y_0)$ , whose slope is m, is $(y-y_0)=m(x-x_0)$.
Thus, the equation of the line passing through point (0, 0), whose slope is m, is
$(y-0) = m(x-0)$
i.e., $y = mx$