Based on this, we can make a table and then graph. <em>x </em>variable is gonna be months, and <em>y </em>variable is gonna be the money. We just need to write six months, and each month increase $20. The initial condition is <em>x=0</em>, in this moment, the money is $500.
x y
0 500
1 520
2 540
3 560
4 580
5 600
6 620
Remember that each pair represents a point to graph the function.