Question

solve the equation 3x -y=7:x+4y=11​

Answer 1

Answer:

$x = 2 \\ y = 2$

Step-by-step explanation:

$3x - y = 7 \\ = > 3x = 7 + y \\ = > x = \frac{(7 + y)}{3}$

$x + 4y = 11 \\ = > x = 11 - 4y$

$11 - 4y = \frac{(7 + y)}{3} \\ \\ = > 3(11 - 4y) = 7 + y \\ = > 33 - 12y = 7 + y \\ = > 33 - 7 = y + 12y \\ = > 26 = 13y \\ \\ y = \frac{26}{13} \\ \\ = > y = 2$

$x + 4y = 11 \\ x + 4 \times 2 = 11 \\ x = 11 - 8 \\ = 2$