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First, split the isosceles triangle down the middle to create a right angled triangle. Then label the opposite, hypotenuse and adjacent. The hypotenuse will be the longest side of the triangle, the opposi...

Recap defintions: factorise essentially means making the equation simpler by finding the common factors. 

This is a simple quadratic because the first term has a coeffecient of 1. therefore we know...

• To help us to see what we need to do in this question, I would always line the equations up one above the other, and label them (1) and (2). Here we'll say that (1) is 3x + 7y =18 and (2) is x+ 2y =...

There will be no need for state symbols.

First of all, to balance these equations, list the number of each atom, for both sides of the equation.

In this example, it would be:
...

x+24-24=15-24

x=15-24=-9