Question

Resolva o sistema x/2 = y/5 x + y = 21

Answer 1

Tarefa

Resolva o sistema

x/2 = y/5

x + y = 21

Explicação passo-a-passo:

x/2 = y/5 = (x + y)/(2 + 5) = 21/7 = 3

x = 2*3 = 6

y = 5*3 = 15

Answer 2

$\frac{x}{2} - \frac{y}{5} = 0 \times (10)\\ x + y = 21 \times ( 2) \\ 5x - 2y = 0 \\ 2x + 2y = 42 \\ 7x = 42 \\ x = 6 \\ \frac{6}{2} = \frac{y}{5} \\ 2y = 30 \\ y = 15$

Testando:

X+Y=21

6+15=21