Question

The cost of 2 bottles of water and 4 apples is $5.50. The cost of 3 bottles of water and 5 apples is $7.50. Find the cost of one apple and the cost of one bottle of water.

Answer 1

Let

x------> the cost of one bottle of water

y-----> the cost of one apple

we know that

2x+4y=5.50 ----> equation A

3x+5y=7.50 ----> equation B

Solve the system of equations by graphing

The solution of the system of equations is the intersection point both graphs

The intersection point is (1.25,0.75)

see the attached figure

therefore

The cost of one bottle of water is $1.25

The cost of one apple is $0.75