book Maths Puzzle Numerical Ability

X2 + y2 = 25 where Y =3

what is the answer? Please Please Please and how did you arrive at it.

9
5
16
4
Thank you so very much inadvance.
trica.

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book Other Question

Bob was taking a 500-mile round trip. After driving for 5 1/2 hours at an average speed of 42 miles per hour, how many miles did he have left to drive? The first side of a triangle is 8m shorter than the second side. The third side is 4times as long as the first side. The perimeter is 26m. Find the length of each side.