exam Maths Puzzle Numerical Ability

I need to solve the equation y=3x & x=3y for both x & y. I can not come up with an answer that makes sense.

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exam Other Question
Solve the following system of linear inequalities by graphing: x - 2y <= 4 and x >= 1. simplify

6.7x(3x-2y)+1.2(x^2-y^2)