Question

x + y = 22
3x - y = 6

Answer 1

Resposta:

$\left \{ {{x+y=22} \atop {3x-y=6}} \right. \left \{ {{y=22-x} \atop {3x-(22-x)=6}} \right. \left \{ {{y=22-x} \atop {3x-22+x=6}} \right.\left \{ {{y=22-x} \atop {3x+x=6+22}} \right. \left \{ {{y=22-x} \atop {4x=28}} \right. \left \{ {{y=22-x} \atop {x=\frac{28}{4} }} \right.\left \{ {{y=22-x} \atop {x=7}} \right. \left \{ {{y=22-7} \atop {x=7}} \right.$⇔$\left \{ {{y=15} \atop {x=7}} \right.$.

Espero ter ajudado, bons estudos!❤