Solve 3(x-2)=21

Firstly, I would explain to the student what exactly the question is asking you to do. When solving an equation we are finding the value of x. I would get the student to read the equation aloud, starting from the x. So the first process done to x is (x-2) and then this entire value is then multiplied by 3. (If the student is not aware that the process inside the brackets is read first, i would make that clear). Since 'multiplied by 3' is the last process spoken, we do the opposite of 'multiply by 3' to the other side of the equals sign: divide by 3, leaving x-2=7. I would then repeat this with the student, the last process done to the x is 'x subtract 2' therefore the opposite should be done to the other side: +2. Leaving the answer x=9.

IN
Answered by Imogen N. Maths tutor

12653 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Rearrange the following equation to make T the subject: (3T+A)/2 = B


A cylinder has a circular face with a diameter of 10cm, and a body of length 30cm. Calculate the volume of the cylinder.


You are given a sequence of numbers: -2, 12, 32, 58, 90, ... Work out the 7th term in this sequence.


The equation of the line L1 is y=3x–2. The equation of the line L2 is 3y–9x+5=0. Show that these two lines are parallel.


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