Answer :
[tex]The\ slope-intercept\ form:\\\\y=mx+b[/tex]
[tex]the\ slope:\ m=50\ miles/hour\\\\y-intercept=120\ miles\\\\\boxed{y=50x+120}[/tex]
[tex]the\ slope:\ m=50\ miles/hour\\\\y-intercept=120\ miles\\\\\boxed{y=50x+120}[/tex]