Question 314857
When {{{x=0}}}, {{{y=50(0)+150=150}}}:(0,150)
When {{{x=-3}}}, {{{y=50(-3)+150=0}}}:(-3,0)
You now have two points, plot them and connect them with a line.
{{{drawing(300,300,-5,5,-100,400,grid(1),circle(-3,0,.25),circle(0,150,.25),graph(300,300,-5,5, -100,400,50x+150))}}}