we can find the slope for B, by using the formula , where and are the points B passes through.
this will be the same slope for all three lines. we now use the point-slope form to get the equation of the lines.
by the point-slope form, the equation of a line with slope that passes through the point is given by:
expand the brackets on the right and solve for y to get it in the slope-intercept form
can you continue?