As you see these are the equations of pair of straight lines. At first what you should do plot all the 4 curves on a graph paper. And inspect where the pair of straight lines are intersecting each other. That particular intersecting point will be the ordered pair solution of the equation. Give it a whole hearted try. Seems to be an easy question. You can solve it.
Question : Simplify the given expression. $(x - 2y)(y - 3x) + (x + y)(x - y) + (x - 3y)(2x + y)$
Question : Find the mean proportion of $x^3y$ and $xy^3$.
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