Question

resuelve el siguiente sistema 3×+9y=4. 2×-y=2​

Answer 1

Ec1: 3x + 9y - 4 = 0
Ec2: 2x - y - 2 = 0
y = 2x - 2

Sustituyo "y" en Ec1:
3x + 9y - 4 = 0
3x + 9(2x - 2) - 4 = 0
3x + 18x - 18 - 4 = 0
21x = 22
x = 22/21

Reemplazo "x" en Ec2:
y = 2x - 2
y = 2(22/21) - 2
y = 44/21 - 2
y = 2/21

Answer 2

A) 3×+9y=4

3× - 9y - 4 = 4 - 4

3× + 9y - 4 = 0

B) 2×-y=2​

2× - y - 2 = 2 - 2

2× - y - 2 = 0