Question

me ajudem nesta questao de sistema

Answer 1

Resposta:

Explicação passo-a-passo:

$\left \{ {{2R+3C=5,70} \atop {3R+5C=9,30}} \right. \\\\2R=5,70-3C\\\\R=\dfrac{5,70-3C}{2}\\\\3R+5C=9,30\\\\3.\Bigg(\dfrac{5,70-3C}{2}\Bigg)+5C=9,30\\\\\dfrac{(17,10-9C)}{2}+5C=9,30\\\\17,10-9C+10C=18,60\\\\C=18,60-17,10\\\\C=1,50\ reais\\\\R=\dfrac{5,70-3C}{2}\\\\R=\dfrac{5,70-3.1,50}{2}\\R=\dfrac{5,70-4,50}{2}\\\\R=\dfrac{1,2}{2}\\\\R=0,60\ reais$