y y\,y is directly proportional to the square root of x x\,x
When y=20,x=16y = 20, x = 16y=20,x=16
Find the possible values of x x\,x when y=15y = 15y=15
Practise Edexcel GCSE Maths Direct and Inverse Proportion with exam-style questions for Foundation and Higher tier. 96 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.