Solve the system using substitution.

-x-y=4
3x-4y=-13

A. (-1,3)

B. (3,-1)

C. (-3,1)

D. (1,-3)

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18