Which relation is a function?

i. {(2, 4), (–1, 7), (3, 0), (5, 4)}
ii. {(–3, 6), (–3, 6), (8, 6), (8, 10)}
iii. {(4, 1), (–2, 5), (–8, 3), (4, 6)}

a. ii only

b. i only

c. i and ii

d. ii and iii

Travis has decided to budget his spending money. he can spend no more than $143.15 every month. he has also decided to spend 5.2 times as much money on video games as he spends on the movies. what linear inequality describes this problem