book Maths Puzzle Numerical Ability

please help me with this.

-3/4y + 1/4 = 1/2

will you show me how you did it?

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book Other Question

Please help me rationalize the expression 2sqrt3+sqrt2/sqrt3-sqrt2 so there are no radicals in the denominator. I came up with 4-sqrt6
Thanks a lot I am stuck on a quadratic graph question.

y = (x-2)squared,

sorry i can`t do a little 2 so i put squared, i can do other quadratic graphs and the working, but can`t find how to solve this 1