book Maths Puzzle Numerical Ability

Subtract, answer in simplest form:
2/5 - y/y-2

Is it -3y-4/y-2?

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book Other Question

Compute the value of the discriminant and give the number or real solutions to the quadratic equation.

-9x^2 +6x -1 =0 if a plane contains 20 points no three of which are collinear how many different triangles can be formed using these points