Question

preciso de ajuda nesse sistema:

$\left \{ {{b-4a=-42} \atop { \frac{2a}{9}+ \frac{5a}{6} =-3}} \right.$

Answer 1

$\left \{ {{b-4a=42} \atop ({ \frac{2a}{9}+ \frac{5a}{6} =-3})*18} \right.$


$\left \{ {{b-4a=42} \atop { 4a+ 15a =-54}} \right.$

$\left \{ {{b-4a=42} \atop {a = \frac{-54}{19} }} \right.$

$\left \{ {({b-4*(\frac{-54}{19})=42})*19 \atop {a = \frac{-54}{19} }} \right.$


$\left \{ {{19b-4*(-54)}=42}*19 \atop {a = \frac{-54}{19} }} \right.$

$\left \{ {{19b+216}=798} \atop {a = \frac{-54}{19} }} \right.$

$\left \{ {{b = \frac{582}{19} } \atop {a = \frac{-54}{19} }} \right$