Question

alguém pode me ajudar????​

Answer 1

Resposta:

a ) x = 15 e y = 7

b) x = 10 e y = 6

Explicação passo a passo:

a)

$\left \{ {x+y=22} \atop {x-y=8}} \right. \\\\\left \{ {{x+y=22} \atop {x-y=8(-1)}} \right. \\\\\left \{ {{x+y=22} \atop {-x+y=-8}} \right. \\\\2y=14\\\\y =\frac{14}{2} \\\\y=7\\\\x+y=22\\x+7=22\\x=22-7\\x=15$

b)

$\left \{ {{2x+y=26} \atop {x-y=4}} \right. \\\\\left \{ {{2x+y=26} \atop {x-y=4*(-2)}} \right.\\\\\left \{ {{2x+y=26} \atop {-2x+2y=-8}} \right.\\........3y=18\\\\y=\frac{18}{3}\\\\y = 6\\........................................................................\\2x+y=26\\2x+6=26\\2x=26-6\\2x=20\\x=\frac{20}{2} =>x=10$

Ajude a ajudar, marque S2

            Boa Sorte!