exam Maths Puzzle Numerical Ability

-5x+2y=10

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Please tell me if this is right.
solve for all values of x.

x-sqrtx=0
4x-sqrtx=0
(4x)^2 = (sqrtx)^2 16x^2 -x=0
16x^2 = x x (16x -1)=0 the similtanious equation graph for y=x+4 and y=2x+2