Question

At a pet store, Rhonda paid $11.50 for 3 dog bowls and 4 bones.

Kelly paid $13 for 2 dog bowls and 8 bones. How much will Andrew
pay for 4 dog bowls and 2 bones?
help

Answer 1

$8.75

Explanation:

Lets put the number of dog bowls as "x" and the number of bones as "y" When we write the equation it comes out like this:

3x+4y=$11.50

2x+8y=$13

Make the "x" equal on both side so we find the lcm of 3 and 2 which 6 so we multiply 2 on the top and 3 on the bottom which changes the equation to

6x+8y=$23

6x+24y=$39 Then we subtract which equals

-16y=-$-13

y=13/16 or 0.8125 we put the "y" on the equation which makes

3x+3.25=11.50 To solve the question: 4(13/16) + 2(2.75)=$8.75 3x=8.25: x= 2.75