The line l1 l_1\,l1 has the equation 5y−10=2x5y - 10 = 2x5y−10=2x The point P P\,P with x x\,x coordinate 4 lies on l1l_1l1. The line l2 l_2\,l2 is perpendicular to l1 l_1\,l1 and passes through the point PPP.
Find an equation for l2 l_2\,l2 in the form ax+by+c=0ax + by + c = 0ax+by+c=0
The lines l1 l_1\,l1 and l2 l_2\,l2 cross the x x\,x axis at the points Q Q\,Q and R R\,R respectively.
Calculate the area of the triangle QPRQPRQPR.
