exam Maths Puzzle Numerical Ability

Please give me an example proof where you use the reflexive property(a=a) correctly.

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exam Other Question

Solve the system by graphing.
x - y = 5
x + y = 3

What I really need help with is what are the plot points? x=(5,0) y=(0,3)? Solve for the indicated variable r+s/t=u.....solve for t