Question 316880
Use the points to calculate the slope.
{{{m=(y2-y1)/(x2-x1)}}}
Then use either point (xp,yp), the slope {{{m}}}, and the point-slope form of a line,
{{{y-yp=m(x-xp)}}}
Then convert to slope-intercept form,
{{{y=mx+(yp-m*xp)}}}