What is an equation of a line with slope −2/3 and a y-intercept of −4?

Ineed to know the answer to this algebra question.

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

22. catie is starting a babysitting business. she spent $26 to make signs to advertise. she charges an initial fee of $5 and then $3 for each hour of service. write and solve an inequality to find the number of hours she will have to babysit to make a profit. interpret the solution.!