Question

Malik stops at the grocery store to buy a bag of diapers and 2 cans of formula. He spends a total of $37. The next week he stops and buys 2 bags of diapers and 5 cans of formula for a total of $87. How much does a bag of diapers cost? How much is one can of formula?

Answer 1

The cost of one bag of diapers is $11 and the cost of one can of formula is $13

Explanation:

Let

x -----> the cost of one bag of diapers

y ----> the cost of one can of formula

we know that

`x+2y=37` -----> equation A

`2x+5y=87` ----> equation B

Solve the system by graphing

Remember that the solution of the system is the intersection point both graphs

The solution is the point (11,13)

see the attached figure

therefore

The cost of one bag of diapers is $11 and the cost of one can of formula is $13