Question

25A+15B=20
4A+6B=2
Qual o valor de A e B?

Answer 1

$\left \{ {{25A+15B=20} \atop {4A+6B=2}} \right.$

$\left \{ {{50A+30B=40} \atop {20A+30B=10}} \right.$

$30A=30$

$A=1$

$4+6B=2$

$6B=2-4$

$6B=-2$

$B=-\frac{2}{6}$

$B=-\frac{1}{3}$