y is proportional to x^2. When y is 75, x is 5. Find a formula for y in terms of x

y is proportional to x2 so this means y = A*x2 for some constant A.

When y = 75, x = 5. Put these values in the formula above to find A:

75 = A*25

75/25 = A

A = 3

So y = 3x2

Answered by Thomas M. Maths tutor

4633 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Find the point(s) of intersection of the curve y=x^2+7x+14 and y=2x+8:


Expand the brackets and simplify: 7(2x+3y)-x(14-y)


Rearrange y = (3x+5)/x to make x the subject


How do I solve 3x + y = 11 & 2x + y = 8?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences