book Maths Puzzle Numerical Ability

Solve the system by addition.

-3x + 5y = 8
x + 2y = 1

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book Other Question

I'm really in Geometry and I have a problem about proving right triangles congruent with algebra. The problem is this: On triangle # 1, one leg is y-x and the hypotenuse is 3y+x. O Square root of (2x-3) + x = 3