Question

3 dog foods + 1 cat food = $30

2 dog food + 2 cat food = $33

What is the cost of the cat food?

Answer 1

$9.75

Explanation:

Set dog food as x and cat food as y

3x+y=30

2x+2y=33

To eliminate y, multiply 3x+y=30 by 2.

6x+2y=60

2x+2y=33

Subtract

4x=27 x=$6.75

Plug that into the 1st equation

3*6.75+y=30

y=$9.75