Craig has a job waiting tables where he earns $3.15 per hour plus tips. craig earned $79.48 in tips during his shift yesterday.

if x represents the number of hours craig worked yesterday, which of the following equations can be used to find the amount of money craig earned yesterday?

a.
y = 3.15x + 79.48
b.
y = 79.48x + 3.15
c.
y = 79.48x - 3.15
d.
y = 3.15x - 79.48