Function because nothing repeats in the domain
It can be a yes because the line cross and make a perpendicular
It’s represents the coupon for each shirt being taken on the price of each shirt
You need do like 25$--------100% of real price
x$---------70%
25x70=100<u>x</u>
1,750=100<u>x</u>
<u> x</u>=1750<u />divided by 100=17.5$
