exam Maths Puzzle Numerical Ability

What are some ways the pythagorean therom is used in everyday life ?? thank you!!~

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exam Other Question

Factoring Completely: how would you solve this problem? (x2 + 12xy + 35y2) This is the problem.

y=x-1
4x-y=19

This is what I tried.

4x-x-1=19
3x-1=19
3x=20
x=6 and 2/3
Thank you very much!