Question

The cost of three notebooks and four pencils is

$8.50. The cost of five notebooks and eight
pencils is $14.50. Determine the cost of one
notebook and the cost of one pencil.

Answer 1

Explanation:

`1. \: \: 3x +4 y = 8.50`

`2. \: \: 5x + 8y = 14.50`

times equation 1 by 2

`3. \: \: 6x + 8y = 17`

3-2 eliminates y variable

`x =2.50`

`y = 0.25`