exam Maths Puzzle Numerical Ability

Solve the system by addition.
x + y = 6
x - y = 4
no book, thanks so much for all you do!!!

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exam Other Question

The length of a rectangle is 1cm longer than its width. If the diagonal of the rectangle is 4cm, what are the dimensions (length and width) of the rectangle?

Talk about confusing to me! Thank you for the help! Solve the system of equations algebrically.
Eliminate the z variable.

2x-y+4z=-2
3x-2y-z=-3
x+4y+2z=17