Question

Liam's bookstore sold 40 notebooks and 20 newspapers for a total of $130.

A day later, the bookstore sold 8 notebooks and 4 newspapers at the same prices, for a total of $28.
How much does a notebook and a newspaper cost at Liam's bookstore?

Answer 1

the answer will be $2 each 2x12=28

Answer 2

let x = price of 1 notebook ($)
let y = price of 1 newspaper ($)
Solving method : Elimination
1st step : write the system of equation
40x + 20y = 130
8x + 4y = 28

2nd step : make the variables equal to each other
-5(8x + 4y ) =( 28)(-5)
-40x - 20y = -140
3rd step : add the equations
40x + 20y = 130
+ -40x - 20y = -140
___________________
0 = -10

Answer : No solution