Question

Steve starts with $350 and spends $35 a week. Chelsea starts with $20 and saves $20 a week. How do you use x for time and y for savings and complete the equations that represent these situations?

Answer 1

The y axis represents money.
The x axis represents time, each unit is one week.

Chelsea's graph would start at `(0,20)` and would increase by `$20` each week, so the equation would be

`y=20x+20`

Steve's graph would start at `(0,350)` and decrease by `$35` each week, so the equation would be

`y=350-35x`