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To solve these equations, our aim is to find a value of x and a value of y that satisfy both equations at the same time. By satisfy we mean, if we plug our values in for x and y then the left hand side...

The method we use to differentiate this form of equation is called the chain rule.

The chain rule is dy/dx = dy/du x du/dx

We can rememeber the right way up of the terms on ...

To solve these eliminations, we must eliminate either the x's or the y's. Either is possible but let us start with the y's. There is 2y in the first equation and (-1)y in the second, so we will have to...

This is a quadratic equation and as such it has zero, one or two solutions depending on the value of the discriminant (b²-4ac). In this equation, a=3, b=-6 and c=2 so b²-4ac = 36-...

This is a quadratic equation so there are two main methods you can use to solve it- factorising and completing the square.

My preferred method and the on...