Question

3x+4y=20-5x-3y=43 solución

Answer 1

3x + 4y = 20 - 5x - 3y = 43

• 3x + 4y = 20 - 5x - 3y

5x + 3x + 4y + 3y = 20

8x + 7y = 20

Empleamos Sistema de Ecuaciones :

• 3x + 4y = 43 ... (× -7)

8x + 7y = 20 ... (× 4)

-21x -28y = -301

32x + 28y = 80

Se van los términos -28y , 28y :

32x - 21x = -301 + 80

11x = - 221

$x = \frac{ - 221}{11} \\ y = \frac{284}{11}$