Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    4
    ReputationRep:
    -x -3 (less than or equal to) 5

    I can plug in any number for x and this is true right?
    Offline

    14
    No. For example, x = -10 fails.
    • Thread Starter
    Offline

    4
    ReputationRep:
    (Original post by Kolya)
    No. For example, x = -10 fails.
    Really? But -10 - 3 = -13 :confused:

    Should I be writing --10 - 3 = 7 then?
    Offline

    14
    ReputationRep:
    if you rearrange you will see that x has to be greater than or equal to -8.

    So anything under -8 will not work
    • Wiki Support Team
    Offline

    14
    ReputationRep:
    Wiki Support Team
    (Original post by HappinessHappening)
    Really? But -10 - 3 = -13 :confused:

    Should I be writing --10 - 3 = 7 then?
    Yes, -(-10) = 10.

    To solve the inequality -x-3\leq 5, firstly add 3 to both sides, then multiply both sides by -1, making sure you abide by the rules.

    The basic rules of manipulating inequalities are: you can add anything to, or subtract anything from, both sides; you can multiply or divide both sides by a positive number; you can multiply or divide both sides by a negative number but you have to change the direction of the inequality (e.g. from > to <).
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    What's your favourite Christmas sweets?
    Useful resources

    Make your revision easier

    Maths

    Maths Forum posting guidelines

    Not sure where to post? Read the updated guidelines here

    Equations

    How to use LaTex

    Writing equations the easy way

    Student revising

    Study habits of A* students

    Top tips from students who have already aced their exams

    Study Planner

    Create your own Study Planner

    Never miss a deadline again

    Polling station sign

    Thinking about a maths degree?

    Chat with other maths applicants

    Can you help? Study help unanswered threads

    Groups associated with this forum:

    View associated groups
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.