You are told that y is proportional to x^2 and that y=75, x=5. Find a formula for y in terms of x.

You know that y is proportional to x2, so let y=kx2 . You also know that y=75 and x=5. Substitute y=75 and x=5 into the equation y=kx2 . Therefore: 75=k multiplied by 52. 75=25k. 75/25=k. k=3. Put k back into the original equation y=kx2 . y=3x2.

Answered by Anna G. Maths tutor

2756 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

One of the teachers at a school is chosen at random. The probability that this teacher is female is 3/5 There are 36 male teachers at the school. Work out the total number of teachers at the school.


Find the area of a kite with length 12cm and height 6cm.


Solve the equation x^2 - 8x + 5 = 0 by completing the square


Write x^2 + 8x + 7 in the form (x + a)^2 + b


We're here to help

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

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences