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Let's take the example: 3(x + 2) + 2(x - 1)

Start with the first part: 3(x + 2)

We have to multiply what is outside of the bracket with the indivi...

2x - 6y = 18

4x + 3y = 6

First, make either the x or y the same value by multiplying the equations. Let's choose x.

2x - 6y = 18      x2

4x + 3y = 6     ...

For any sequence where there is a common difference (it increases or decreases with the same amount, n, each time) you can find the nth term using the formula: dn+(a-d)&q...

Surds are numbers left in 'square r...

y=6x-2

x²-4x+19

Both equations are equal to Y, hence can be substituted into each other;

6x-2= x^2-4x+19

Now we only have X terms in our equations

Br...