Question

Check whether the following is the solution of the equation x – 2y = 4 or not:

`(sqrt2", "4sqrt2)`

Answer 1

Putting `x = sqrt2` and `y = 4sqrt2`  in the L.H.S of the given equation,

x − 2y = `sqrt2-2(4sqrt2)`

= `sqrt2-8sqrt2`

= `-7sqrt2`

≠ 4

L.H.S ≠ R.H.S

Therefore, `(sqrt2", "4sqrt2)` is not a solution of this equation.