Question

2x+y=2
3x+y=4

Qual eh a resposta desse conjunto?

Answer 1

2x + y = 2      *(-1)

3x + y = 4

- 2x - y = - 2

3x + y = 4

x = 2

3x + y = 4

3(2) + y = 4

6 + y = 4

y = 4 - 6

y = - 2

Resposta: ( 2, -2 ).

Answer 2

Resposta:

X= 2

Y= -2

Explicação passo-a-passo:

$\left \{ {{2x+y=2} \atop {3x+y=4}} \right. \\\left \{ {{2x+y=2 *(-1)} \atop {3x+y=4}} \right. \\\left \{ {{-2x-y=-2} \atop {3x+y=4}} \right. \\\\x=2\\\\2x+y=2\\2*2+y=2\\4+y=2\\y=2-4\\y=-2$