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Alice spent $131 on shoes. Flip flops cost $15 and Sneakers cost $28. If she
bought a total of 7 shoes, then how many of each kind of shoe did she
buy? Write the answer as an ordered pair...(flip flops, sneakers). Do not
include the units. *

Sagot :

Adioabiolaidn

Answer:

Flip flops = 5

Sneakers = 2

Step-by-step explanation:

Let

x = flip flops

y = sneakers

x + y = 7 (1)

15x + 28y = 131 (2)

From (1)

x = 7 -y

Substitute x = 7 - y into (2)

15x + 28y = 131

15(7 - y) + 28y = 131

105 - 15y + 28y = 131

-15y + 28y = 131 - 105

13y = 26

y = 26/13

= 2

y = 2

Substitute y = 2 into (1)

x + y = 7

x + 2 = 7

x = 7 - 2

= 5

x = 5

Flip flops = 5

Sneakers = 2

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