Question

solve x and y, 2x+y=12 and x-y=9?​

Answer 1

2x + y = 12 ----- (i)

x - y = 9 ----- (ii)

From (ii), x = (9 + y)

Putting this value in equation (i), we get,

→ 2(9+y) + y = 12

→ 18 + 2y + y = 12

→ 18 + 3y = 12

→ 3(6 + y) = 12

$\to \frac{3(6 + y)}{3} = \frac{12}{3}$

→ 6 + y = 4

→ y = 4 - 6

→ y = (-2)

Now,

x = 9 + y

x = 9 + (-2)

x = 9 - 2 = 7

Thus,

• Value of x = 7
• Value of y = -2