Graphically might be the simplest answer.
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Its called Simultaneous Equations
Pros: There are many real life situations in which the relationship between two variables is quadratic rather than linear. So to solve these situations quadratic equations are necessary. There is a simple equation to solve any quadratic equation. Cons: Pupils who are still studying basic mathematics will not be told how to solve quadratic equations in some circumstances - when the solutions lie in the Complex field.
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Graph the equation then find the x intercepts.
Simultaneous equations have the same solutions