This problem aswell not get it fully

Solve for x i'll try to attach the files bc it's not letting me for some reason

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

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?