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Since Sariyah earns $8 per hour, you want to consider her potential earnings for a week. Because she can work anywhere from 0 to 20 hours per week, you should calculate the maximum amount she could earn in a week. This is done by multiplying her hourly wage by the maximum number of hours:
$8/hour * 20 hours/week = $160/week
For the y-axis, which represents Sariyah's earnings, you will need a scale that encompasses her minimum earnings ($0, if she works 0 hours) to her maximum earnings ($160, if she works 20 hours). While you could use a scale of 0 to 160, using 0 to 200 adds clarity to the graph and ensures that the maximum is comfortably within the scale without having to mark off irregular intervals on the y-axis.
Thus, a reasonable scale for the y-axis would be:
0 to 200