exam Maths Puzzle Numerical Ability

Solve the following 2 x 2 systems using substitutions
3x + y + 13
5x - y =3

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exam Other Question

Solve equation w/ two radicals

Square over 2x+3 - Square over x+1=1 This is a very long queation, and i have no idea of how to figure it out. I am totally confused on this. It is a long queation, and it is two parts.

part 1: find the loganthn