Question

Solve this simultaneous equation x+2y=11
x-2y=1

Answer 1

using elimination method multiply both equations by 2...then subtract equation 2 from 1

Answer 2

Equation 1,

`x + 2y = 11`

Equation 2,

`x - 2y = 11`

Take equation number 2.

`x - 2y = 11 \\ x = 11 + 2y`

Substitute 'x' in Equation number 1.

`x + 2y = 11 \\ 11 + 2y + 2y = 11 \\ 11 + 4y = 11 \\ 4y = 11 - 11 \\ 4y = 0 \\ y = (0)/(4) \\ y = 0`

y = 0.

So x,

`x = 11 - 2y \\ x = 11 - 2(0) \\ x = 11 - 0 \\ x = 11`

x = 11.