Question

solve the simultaneous eqn :
x + 2y + 9 = 0
3x + 4y + 17 = 0

Answer 1

hope it helps me...............

Answer 2

x + 2y = - 9  ... (1)

3x + 4y =  - 17  ... (2)

Multiply (1) by 3:

→ 3(x +  2y) = (-9)3

→ 3x + 6y = - 27 ... (3)

(3) - (2):

→ (3x + 6y) - (3x + 4y) = - 27 - (-17)

→ 2y = - 27 + 17 = - 10

→ y = (-10/2) = - 5

Putting the value of y  in 1equation,

x + 2(-5) =  -9 

x = 10 - 9 = 1

Therefore, x = 1 & y = - 5