beth would like to save money on her monthly copy machine bill and considers switching to a different plan. a second plan costs 175$ per month and includes 100 copies. each copy above 100 copies costs an additional $0.10. this equation can be used to find the total cost, y , based on the number of copies, x , where x>100. y=175+0.10(x-100). b. determine when the two plans cost the same amount . show your work or explain how you know?