exam Maths Puzzle Numerical Ability

I am wondering what if an equation had three variables, how would you solve and graph it? Does it change the graph?

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exam Other Question

A rectangle having area 120 square meters has sides of length X+3 meters and x+10 meters. What is the length of a diagonal of the rectangle? Solve the system by graphing.
2x + y = 8
2x - y = 0