ПОМОГИТЕ РЕШИТЬ ЗАДАЧУ. УСЛОВИЕ И РЕШЕНИЕ ЗА 6 УЧЕБНИКОВ И 10 ТЕТРАДЕЙ ЗАПЛАТИЛИ...

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ПОМОГИТЕ РЕШИТЬ ЗАДАЧУ. УСЛОВИЕ И РЕШЕНИЕ

ЗА 6 УЧЕБНИКОВ И 10 ТЕТРАДЕЙ ЗАПЛАТИЛИ 205,5 ЛЕЯ , А ЗА 8 УЧЕБНИКОВ И 5 ТЕТРАДЕЙ ЗАПЛАТИЛИ 219,5 ЛЕЯ . СК-КО СТОИТ ОДИН УЧЕБНИК И ОДНА ТЕТРАДЬ

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juliya200013

Verified answer

Y-учебники
х-тетради
$\left \{ {{6y+10x=205,5} \atop {8y+5x=219.5 |*2}} \right.$
$-\left \{ {{6y+10x=205.5} \atop {16y+10x=439}} \right.$
6y-16y=205,5-439
-10y=-233,5 |:10
y=23.35-цена учебника
$\left \{ {{y=23.35} \atop {6*23,35+10x=205.5}} \right.$
$\left \{ {{y=23,35} \atop {10x=65,4}} \right.$
$\left \{ {{y=23,35} \atop {x=6,54}} \right.$
Ответ:1 учебник-23,35, 1 тетрадь-6,54

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