Question

An internet service provider charges $20 per month plus an initial set-up fee. One customer paid a total of $92 after 2 months of service. Write an equation modeling this situation.

Answer 1

`\int\limits^(x+2)_0 {20} \, dt = 20t\left \{ {{t=x+2} \atop {t=0}} \right. = 20(x+2). \\\int\limits^(92)_0 {(y)/(92) -1} \, dt = ((y)/(92)t-t) \left \{ {{y=92} \atop {x=0}} \right. = y-92\\ y-92=20(x+2)`