Given
25x−2125y+1=625 \frac{25^{x-2}}{125^{y+1}} = 625 125y+125x−2=625express y y\,y in terms of xxx, writing your answer in its simplest form.
134 exam-style questions on Edexcel AS Level Maths Algebraic Expressions, covering 1.1 Index Laws, 1.2 Expanding Brackets, 1.3 Factorising, 1.4 Negative and Fractional Indices, and 1.5 Surds. Each one has a worked solution and a mark scheme showing where the marks go.