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23.07.2019 •
Mathematics
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 $28. how much does a notebook and a newspaper cost at liam's bookstore?
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Ответ:
let y = price of 1 newspaper ($)
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
Ответ:
Ответ: