Question 47033
Solving the first equation for y gives {{{y=-expr(1/2)x+expr(90/4)}}}.  The second equation is already solved for y.  Now just create a couple of ordered pairs by selecting some values of x to get y, plot those points, connect them, and see where they intersect (solution).  The graph is:
{{{graph(300,300,-2,34,-3,10,-x/2+90/4,x/8+25/8)}}}