Eric received a gift card worth $25 as a birthday present. He is spending $2.50 per day using the gift card, as shown in the graph below. Which statement is true about the linear function that represents his gift card spending?

Question

Zayden Short

Mathematics

24 February, 20:48

Eric received a gift card worth $25 as a birthday present. He is spending $2.50 per day using the gift card, as shown in the graph below. Which statement is true about the linear function that represents his gift card spending?

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Answers (1)

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Matthias Wright · Answer 1

We are given the initial mount of $25 and the consumption of $2.50 per day. In linear algebry, the initial amount is y-intercept and the consumption is the slope. In equation form, that is

y = - 2.5x + 25

where x is the number of days

and y is the amount left

The total amount will be used up after

0 = - 2.5x + 25

x = 10 days