A plumber charges $25 for a service call plus $50 per hour of service. Write an equation for the cost, y, after x hours of service.
Unit Rate:
Y-Intercept:
Equation:

There is a linear relationship between a salesperson sales and her weekly income.if her sales are $200 her income is $500 and if her sales are 1,200 her income is $600.what is the relationship between sales and income