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Math Help - Express Y coordiante

  1. #1
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    Express Y coordiante

    Hello
    Help with the question on my drawing please?
    its a rectangle in isoceles right triangle
    Attached Thumbnails Attached Thumbnails Express Y coordiante-y-coor.jpg  
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  2. #2
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    Hello BadMonkey
    Quote Originally Posted by BadMonkey View Post
    Hello
    Help with the question on my drawing please?
    its a rectangle in isoceles right triangle
    If the triangles are isosceles and right-angled, then B is the point (0,1). So the equation of AB is
    x+y=1
    So, making y the subject:
    y = 1-x
    which gives the value of y at the point P.

    Grandad
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  3. #3
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    Thanks
    I got that but I was no sure if it was correct

    but I done it this way y-y1=m(x-x1)
    1-x=0(1-x)
    would it be correct to write it like this also?
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  4. #4
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    Hello BadMonkey
    Quote Originally Posted by BadMonkey View Post
    Thanks
    I got that but I was no sure if it was correct

    but I done it this way y-y1=m(x-x1)
    You can certainly use
    y-y_1=m(x-x_1)
    to get the equation of the line. Using
    x_1=1,\;y_1=0 and m = -1
    gives
    y-0=-1(x-1)

    \Rightarrow y = 1-x
    But this line doesn't make sense, and is not correct:
    Quote Originally Posted by BadMonkey View Post
    1-x=0(1-x)
    would it be correct to write it like this also?
    Grandad
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