Question

$\left \{ {{2x+y=3} \atop {3x+=2y=4}} \right.$

Answer 1

$\left \{ {{2x+y=3} \atop {3x+2y=4}} \right.$

Isolei o y. y = 3 - 2x

3x + 2(3 - 2x) = 4

3x + 6 - 4x = 4

-x = 4-6

(-x = -2) × (-1)

x = 2

Voltando pro isolamento do y. y = 3 - 2x → y = 3 - 2 × 2

y = 3 - 4

y = -1

Para ver se esta correto

2 × 2 + (-1) = 3

4 - 1 = 3

3 = 3

3 × 2 + 2 × (-1) = 4

6 - 2 = 4

4 = 4