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IRINA_888 [86]
3 years ago
8

A store charges their customers based on the number of items that they buy. Jane bought four items and was charged $15 and Georg

e bought twelve items and was charged $39. Write a function to model the cost based on the number of items you buy. Then determine how much you are charged if you purchase 22 items.
Mathematics
2 answers:
devlian [24]3 years ago
6 0
Use a rational expression to determine that F(x)= 3x+3=33 
By taking the +3 and moving it over to the other side, it would give you a negative 3, so 33-3= 30 and 3 multiplied by x equals 30. Our answer would be x=10
Verdich [7]3 years ago
6 0

Answer:

The function is y=3x+3

She would be charged $69 dollars for 22 items.

Step-by-step explanation:

We are given that,

Jane was charged $15 for buying 4 items.

Jane was charged $39 for buying 12 items.

Since, we have,

15 = 3 × 4 + 3

39 = 3 × 12 + 3

So, the function modeled for this situation will be,

Let, y = amount of money charged in dollars and x = number of items bought.

Then, the function is y=3x+3.

Further, when she purchases 22 items, the cost would be,

y=3\times 22+3 implies y=66+3 i.e. y= 69 (dollars)

Hence, she would be charged $69 dollars for 22 items.

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