Si compro 7 cuadernos y 3 lapiceros gasto $ 44 Pero si compro 7 lapiceros y 3 cuadernos gasto $ 36 ¿Cuánto cuesta 1 lapicero y
1 cuaderno?
2 answers:
Sea x el numero de cuadernos & y el numero des lapiceros:
Entonces traducir el Español al lenguaje de matamaticas:
7x+3y=44
3x + 7y =36
Y encontrarás x=$5 & y=$3
Un cuaderno = $5
Un lapicero = $3
7 cuadernos × $5 = $35
3 lapiceros × $3 = $9
$35+$9=$44
7 lapiceros × $3 = $21
3 cuadernos × $5 = $15
$21+$15=$36
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