From June 2015 Edexcel paper: Solve 7x + 8 = 2x – 3

Whenever you have a question asking you to solve an algebraic equation with only one unknown (x) you must put all 'x' terms on one side of the equation and all non-'x' terms on the other: 1. Take 2x away from both sides 7x + 8 - 2x = -3 5x + 8 = -3 2. Now take 8 away from both sides, leaving only 'x' terms on the left and only numbers on the right 5x = -3 - 8 5x = -11 3. To solve for 'x' we need to divide both sides by 5 x = -11/5 x = -2.2 It is fine to leave the answer in either form (as a fraction or a decimal). Be warned though that if the answer doesn't result in a friendly decimal (one or two dp.) then it is best to leave it as a fraction.

Answered by John J. Maths tutor

6384 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

A level - Find the coordinates of the stationary point of the curve with equation : (x+y-2)^2 + e^y -1


FIRSTLY: John has a slice of pizza in the exact shape of an isosceles triangle. 2 sides measure Y + 5 and 1 side measures Y – 2. Write an expression for the total perimeter. SECONDLY: Multiply out the following brackets: (3Y + 8)(3Y + 2)


Draw the graph y=tanx in the region -180 degrees =< x =< 180 degrees


How do you work out the gradient of a straight line?


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