The gradient (or slope) of the parallel line will be the same, which is 8. We know the values of x and y so if we put those in the equation for a straight line, y=mx+c, we get 12= 8(3)+c. 8*3 is 24 so 12=24+c, if we takeaway 24 from both sides we are left with c=-12 so the equation of the parallel line is y=8x-12.