x is inversely proportional to P. When P = 6, x =2. What does x = when P = 4?
We know x is inversely proportional to P, so immediately we know their relationship is of the form x = k/P , where k is a constant. We are also given some conditions we can use to solve for k: when x = 2, P = 6. Subbing these into our equation: 2 = k/6, and multiplying both sides by 6 gives k = 12. We can now substitute this in for our second conditions, when P = 4. As k is a constant its value remains unchanged, even as P and x do, therefore: x = 12/4 i.e x = 3.
AS
Related Maths GCSE answers
All answers ▸A box contains an assortment of 100 coloured marbles, coloured red, blue and green. The ratio of blue balls to green balls is 1:3. If there are 16 red balls in the box, what is the ratio of red balls to green balls, and red balls to blue balls?
What is the difference between the median and the mean values for this set of data: 11, 9, 21, 6, 18, 2, 17, 8, 7.
A right angled triangle has sides of length 3 and length 4, what is the length of the hypotenuse?
Find an equation of the straight line that is perpendicular to the straight line x + 3y = 7 and that passes through the point (4,9).