Turn on thread page Beta
    • Thread Starter
    Offline

    14
    ReputationRep:
    (x+y)^2 = 4
    2y - x = 0

    what do you get?
    Offline

    2
    ReputationRep:
    (Original post by mik1a)
    (x+y)^2 = 4
    2y - x = 0

    what do you get?
    2y-x = 0 => x=2y

    So, (3y)^2 = 4

    9y^2 = 4

    y^2 = 4/9

    y = 2/3 or y = -2/3

    y=2/3, x=4/3

    y=-2/3, x=-4/3
    Offline

    2
    ReputationRep:
    (Original post by mik1a)
    (x+y)^2 = 4
    2y - x = 0

    what do you get?
    basically to make those easy, you just have to rearrange and subsititue in for x or y
    • Thread Starter
    Offline

    14
    ReputationRep:
    that seems really obvious now thanks... i did it some other way and got 1/3, -1/3 2/3, -2/3 :s got to make less errors...
    Offline

    2
    ReputationRep:
    (Original post by mik1a)
    that seems really obvious now thanks... i did it some other way and got 1/3, -1/3 2/3, -2/3 :s got to make less errors...
    fewer errors not less :-)
    • Thread Starter
    Offline

    14
    ReputationRep:
    lol rub it in
 
 
 

2,210

students online now

800,000+

Exam discussions

Find your exam discussion here

Poll
Should predicted grades be removed from the uni application process

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

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