Make n the subject of the formula: m = 5n - 21

The answer is: n = (m + 21)/5 How did we get this? Right now, the equation is written in the form where m is the subject. We want to rearrange this so that n is the subject of the formula. The formula should look like this: n = ___________________ So how do we do this? Step 1) We plus 21 to both sides of the equation. So the equation should now read m + 21 = 5n Step 2) Now we know that 5n = m + 21. We want to know what 1n equals so we have to divide both sides by 5. The equation is now 1n = (m + 21)/5 which is your answer. Does this make sense? If so, try the next questions! * Make R the subject of the formula:       S = 3r + 15 * Make y the subject of the formula:       X = 1/2 y + 20 

JC
Answered by Jabin C. Maths tutor

18987 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Factorise x^2+2x-8


Solve the simultaneous equations: 3x + y = -4 and 3x - 4y = 6


multiply out (2x-4)(x-2) and simplify.


How do you solve a quadratic equation? I always forget how to do that!


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