Question

two turkey burgers and a bottle of water cost $3.25. If three turkey burgers and a bottle of water cost $4.50,What is the cost of tw bottles of water?

Answer 1

$1.50

Explanation:

let b be the number of turkey burgers and w be the number of bottles of water.

`2b + w = 3.25\\3b + w = 4.50`

becomes

`3b + w = 4.50\\- (2b + w)=3.25`

`b = 1.25`

substitute this into one of the original equations:

`3b + w = 4.5\\3 * 1.25 + w = 4.5\\3.75 + w = 4.5\\w = 0.75`

two bottles of water equals 0.75 * 2 = 1.50