Andrea receives a $40 gift card to use at the roller rink. it costs her $8 per visit to skate. write a function relating the value of the gift card, v, in terms if the number of visits, n.

The value of the gift card = v = $40
The visit to the skate cost = $8
The number of visits = n 
∴ n = the value of the gift card over the cost of one visit to the skate
∴ n = v/8 = 40/8 = 5

The general function for relating the value of the gift card, v, in terms if the number of visits, n. ⇒⇒⇒   v = 8n