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Math Help - Equation of straight line

  1. #1
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    Question Equation of straight line

    How to solve this ?

    A straight line L passes through the point (0,-1) and is parallel to the straight line y=3x+1

    a) write down the equation of the straight line L.

    b) Given that L passes through the point (2,b) find the value of b.
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  2. #2
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    Re: Equation of straight line

    Quote Originally Posted by haftakhan View Post
    How to solve this ?

    A straight line L passes through the point (0,-1) and is parallel to the straight line y=3x+1

    a) write down the equation of the straight line L.

    b) Given that L passes through the point (2,b) find the value of b.
    The slope will be 3 and the y-intercept (0,-1).
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  3. #3
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    Re: Equation of straight line

    cant understand ur answer
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    Re: Equation of straight line

    Quote Originally Posted by haftakhan View Post
    cant understand ur answer
    Are you saying that you cannot use the slope intercept form?
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  5. #5
    MHF Contributor Also sprach Zarathustra's Avatar
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    Re: Equation of straight line

    Quote Originally Posted by haftakhan View Post
    How to solve this ?

    A straight line L passes through the point (0,-1) and is parallel to the straight line y=3x+1

    a) write down the equation of the straight line L.

    b) Given that L passes through the point (2,b) find the value of b.


    A slope of all lines parallel to y=3x+1 is 3(why?)

    So, for (a), you have m=3 and some point on this line , that is (0,-1)... can you construct this line?
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