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Need help in Maths Qs.

  • 13-07-2014 12:33pm
    #1
    Take Your Pants Off
    Registered Users, Registered Users 2 Posts: 1,519 ✭✭✭


    I cant seem to get Q4 at all especially part a
    Part of Q9 I cannot get part f and g


Comments

  • #2
    Take Your Pants Off
    Registered Users, Registered Users 2 Posts: 1,519 ✭✭✭Take Your Pants Off


    I am not sure if i got part d right in relation to Q 10.
    Also I cannot get e, do you put x equals 0 and y equals 0.
    Because I tried that with the equation I got from previous question but the x value sums up as fraction so maybe the equation is wrong for part d


  • #3
    Peregrine
    Moderators, Education Moderators Posts: 26,403 Mod ✭✭✭✭Peregrine


    Dude, it's July :p

    I haven't done co-ordinate geometry for over a month now, I'll have a look at them this evening.

    But seriously, go get wasted or something :pac:


  • #4
    Peregrine
    Moderators, Education Moderators Posts: 26,403 Mod ✭✭✭✭Peregrine


    Q4, a lot of people get caught out with this question. Once you know about the properties of the equation of the line, it's easy.

    When an equation of a line is written in the form y = mx + c, m = slope and c = y intercept.

    You can start by re-writing the four equations in the form y = mx + c. You'll see that 2 of them have equal and positive slopes and the other 2 have equal and negative slopes. Looking at the y intercepts of the lines (c value), 2 of them have a y intercept of 4 and the other 2 have -2.

    Now you know which ones are which. Positive slope + y intercept of 4 = m, negative slope + y intercept of 4 = j and so on. Once you understand how it works, you'll probably be able to recognise and label them just by looking at it.

    For part b, mark your y intercepts and then just go from there.

    Once you do b, part c should become more clear.



    The other two are full Section B questions, I'll do them tomorrow :o


  • #5
    Take Your Pants Off
    Registered Users, Registered Users 2 Posts: 1,519 ✭✭✭Take Your Pants Off


    Nimr wrote: »
    Q4, a lot of people get caught out with this question. Once you know about the properties of the equation of the line, it's easy.

    When an equation of a line is written in the form y = mx + c, m = slope and c = y intercept.

    You can start by re-writing the four equations in the form y = mx + c. You'll see that 2 of them have equal and positive slopes and the other 2 have equal and negative slopes. Looking at the y intercepts of the lines (c value), 2 of them have a y intercept of 4 and the other 2 have -2.

    Now you know which ones are which. Positive slope + y intercept of 4 = m, negative slope + y intercept of 4 = j and so on. Once you understand how it works, you'll probably be able to recognise and label them just by looking at it.

    For part b, mark your y intercepts and then just go from there.

    Once you do b, part c should become more clear.



    The other two are full Section B questions, I'll do them tomorrow :o

    Thanks so much


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