# Past Papers’ Solutions | Edexcel | AS & A level | Mathematics | Core Mathematics 1 (C1-6663/01) | Year 2015 | June | Q#7

Question

Given that ,

a.   Express  in terms of y.

b.   Hence, or otherwise, solve

Solution

a)

We have;

We are given;

Therefore;

b)

We are given;

As demonstrated in (a)  and given , therefore;

Now we have two options.

Substituting these values in following given equation yields corresponding values of x.

 For ; For ;