book Maths Puzzle Numerical Ability

Explain Substituting Equations

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how do u do this problem y=2x+5 u have to make a input output box and i dont know how to do it. i have to get this done tonight can u please please show me? A Triangle is bisected down the middle. The height is 15 and the two hypotnuses are 25 and y. What is X and Y?