exam Maths Puzzle Numerical Ability

can you name the property illustrated by each
1.x + y = y + x

2.k + 0 = k

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exam Other Question

The line is parallel to the line whose equation is 7x + y = 7 and has the y-intercept zero.

This is not out of a book! How do you add this rational expression: 3x/10 + 9x/10? Whats the answer?