Tina uses a $50 gift card certificate to buy a pair of pjs for $17.97 a necklace for $25.49 and three pairs of socks that each cost the same amount tina has to pay $0.30 because the gift card certificate does not cover the total cost of all the items how much does each pair of socks cost?

You said she had to pay $0.30, but in the picture it looks like it says she pays $0.33, so I used the 0.33 amount.

The gift card was $50, she had to pay 0.33 cents, so total paid was $50.33

The total for the pajamas and necklace was: 17.97 + 25.49 = 43.46

Subtract that from the total spent to find the total cost of the socks:

50.33 - 43.46 = 6.87 ( total cost for 3 pairs of socks)

Now divide that by 3 to find the cost of 1 pair:

6.87 / 3 = $2.29 per pair

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value