Aprofessional guitarist charges $400 to perform at a restaurant. at the end of the night he collected his tips and left with a total earning of $620. write an equation and solve for the amount he made in tips for the performance.

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000