Rae earns $60 for playing music on Saturday nights at the local coffee house. She makes an average of $5.25 in tips per hour. Write the function of Rae's earnings and solve for how much she would make after 4 hours.
(A) y = 5.25x + 60; $65.25
(B) y = 60x + 5.25; $85.75
(C) y = 5.25x + 60; $81.00
(D) y = 60x + 5.25; $185.25

Question

Rae earns $60 for playing music on Saturday nights at the local coffee house. She makes an average of $5.25 in tips per hour. Write the function of Rae's earnings and solve for how much she would make after 4 hours.
(A)  y = 5.25x + 60; $65.25
(B)  y = 60x + 5.25; $85.75
(C)  y = 5.25x + 60; $81.00
(D)  y = 60x + 5.25; $185.25

anonymous · Answer

what is the variable part?

anonymous · Answer

I know the slope is $5.25.... I just don't get how you would solve it.

anonymous · Answer

well, the earnings would be the lump sum plus the hourly tip amount times the number of hours, which I would call x

anonymous · Answer

I'm just guessing C...

anonymous · Answer

correct, but why?

anonymous · Answer

Refer to the attached plot

anonymous · Answer

idk because I know the slope is $5.25 and so that eliminates B and D and then I know you wouldn't just add 60 and $5.25 because there's an x involved... so C is the best choice by elimination.

anonymous · Answer

well, it's the tip average of $5.25 times the hours x plus the $60 so y=5.25x+60 and then you plug in 4 for x and you get 81