Make u the subject of the formula: (1/u) + (1/v) = 1

Firstly, make the denominators (the bottom part of a fraction) the same. Do this by multiplying each fraction with the denominator of the other fraction. Then, write the equations as one. It should now be: (v+u)/uv = 1.Now, you can multiply ‘vu’ by 1 and rearrange the equation to get all terms with ‘u’ on one side. Then factorise the u out and divide both sides of the equation by the factorised part to get u on one side. The final answer should be: u = v/(v-1)