Question

1/2×-2y=3
{1/5×+3y=7

Answer 1

1 / 2x - 2y = 3

1 / 5x + 3y = 7

Trabajemos con cifra decimal :

0.5x - 2y = 3

0.2x + 3y = 7

Despejamos x en ambas ecuaciones :

0.2 ( - 3 + 2y ) = 0.5 ( - 7 - 3y )

- 0.6 + 0.4y = - 3.5 - 1.5y

0.4y + 1.5y = - 3.5 + 0.6

1.9y = - 2.9

y = - 1.52631

Remplazamos : 1ra ecuación .

0.5x = 3 + 1.52631

0.5x = 4.52631

x = 4.52631 / 0.5

x = 9.05262

4.52631 - 1.52631 = 3

2da ecuación :

0.2x = 7 + 1.52631

0.2x = 8.52631

x = 8.52631 / 0.2

x = 42.63155

8.52631 - 1.52631 = 7