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Pretty simple question, just need some help watch

    • Thread Starter
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    Basically for some homework i gotta find the equation of the line that passes through these two points

    ( 1 , 4 ) ( 7 , 10 )

    i know gradient is (10 - 4)/ (7 - 1)

    so gradient is 6/5x

    but need to know where to go from here
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     y - y_1 = m(x-x_1)

    m = gradient....sub in the values and rearrange to get y and you're sorted
    • Thread Starter
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    ah yes cheers m8, how stupid. ty
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    No question is stupid anytime!
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    (Original post by jimbo lad)
    i know gradient is (10 - 4)/ (7 - 1)

    so gradient is 6/5x
    You might want to check that arithematic.
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    ^^ agreed, totally missed that.
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    (Original post by ghostwalker)
    You might want to check that arithematic.
    Eh?

    I'm not keen on the x following his number either.
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    Spelling nazi's in the math forum.....dear me, what will they think of next lol....
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    the gradient is 1 not 6/5x, a gradient never has an x attached to it
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    (Original post by boromir9111)
    Spelling nazi's in the math forum.....dear me, what will they think of next lol....
    Isn't arithematic a member of Scissor Sisters?

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    y = mx + c

    you worked out m, and you have two examples of (x,y) pairs that definitely work (since the whole point is that it passes through them), so use that to find c, and once you have m and c that's it, you've uniquely defined the line.
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    (Original post by Mr M)
    Eh?

    I'm not keen on the x following his number either.
    I was more concerned with the 7-1.

    And I always have to think when it comes to spelling arithmetic, unfortunately my fingers don't always type what's gong (!) through my head, so two opportunties to screw up.
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    (Original post by Mr M)
    Isn't arithematic a member of Scissor Sisters?

    Cool picture. Where did you get that from? Not sure your Mrs would be too fond of it lol :p:
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    (Original post by boromir9111)
    Cool picture. Where did you get that from? Not sure your Mrs would be too fond of it lol :p:
    She's reading over my shoulder. Stop trying to get me into trouble.
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    (Original post by Mr M)
    She's reading over my shoulder. Stop trying to get me into trouble.
    Lol. Nice try. You should give comedy a try along side teaching maths, you seriously have some talent there
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    haha sorry peeps i feel well silly now, and ye i know about the x thing but i usually put it there just for working things out because it helps me to understand its the gradient.
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    Don't worry about it, just don't do it in the exam and you'll be fine
 
 
 
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