book Maths Puzzle Numerical Ability

can u help me wiht these problems
solve for y
2/3y + 4=2x

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I NEED HELP SOLVING THIS:
(4X + 3W^2)(4X - 3X^2) Use parabolas to work the following problem: find two numbers having a sum of 50 such that the sum of the square of one and three times the square of the other is a minimum.