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Math Help - The quation of a straight line is 3x+2y=5....

  1. #1
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    The quation of a straight line is 3x+2y=5....

    Question:
    The equation of a straight line is 3x+2y=5. Given that the points (s,4) lies on the line, find the value of s

    My solution:
    2y=-3x+5
    y=-1.5x+2.5
    4=-1.5x+2.5
    x= (4-2.5)/-1.5
    Therefore s= -1

    Is this right?

    Thanks
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  2. #2
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    Re: The quation of a straight line is 3x+2y=5....

    Quote Originally Posted by FailInMaths View Post
    Question:
    The equation of a straight line is 3x+2y=5. Given that the points (s,4) lies on the line, find the value of s

    My solution:
    2y=-3x+5
    y=-1.5x+2.5
    4=-1.5x+2.5
    x= (4-2.5)/-1.5
    Therefore s= -1

    Is this right?

    Thanks
    Hi FailInMaths,

    Yes. It is correct.
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  3. #3
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    Re: The quation of a straight line is 3x+2y=5....

    Thanks!
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  4. #4
    MHF Contributor Siron's Avatar
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    Re: The quation of a straight line is 3x+2y=5....

    Note:
    If you substitute the point (s,4) in the equation then you get:
    4=\frac{3}{2}s+2,5

    You used x in stead of s which can be confusing.
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