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Math Help - I need some questions checked please!

  1. #1
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    I need some questions checked please!

    I am reasonably certain that these are correct, but I just want to make sure.


    Find the slope and y-intercept of the following:

    5x-2y=3
    My answer: y=(5/2)x+(3/2)
    ------------
    Indicate which of the following sets of lines are parallel,perpendicular, or neither.

    y=2x-5
    y=2x+5
    My answers(respectively):slope=2,y-intercept=-5
    slope=2,y-intercept=5
    The lines are parallel.
    ********************
    3x+y=5
    -x+3y=6
    My answers(respectively):y=-3x+5
    y=(1/3)x+2
    The lines are neither.
    *********************
    3x+y=5
    x+y=3
    My answers(respectively):y=-3x+5
    y=-x+3
    The lines are neither.

    Thank you in advance for you help!
    Drakmord
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  2. #2
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    Quote Originally Posted by drakmord View Post
    I am reasonably certain that these are correct, but I just want to make sure.


    Find the slope and y-intercept of the following:

    5x-2y=3
    My answer: y=(5/2)x+(3/2)
    5x-2y=3

    -2y=3-5x

    y=\frac{5x}{2}-\frac{3}{2}
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  3. #3
    Master Of Puppets
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    Quote Originally Posted by drakmord View Post

    y=2x-5
    y=2x+5
    My answers(respectively):slope=2,y-intercept=-5
    slope=2,y-intercept=5
    The lines are parallel.
    Correct!



    Quote Originally Posted by drakmord View Post


    3x+y=5
    -x+3y=6
    My answers(respectively):y=-3x+5
    y=(1/3)x+2

    The lines are neither.
    gradients are -3 and \frac{1}{3} so are perpendicular

    Quote Originally Posted by drakmord View Post


    3x+y=5
    x+y=3
    My answers(respectively):y=-3x+5
    y=-x+3
    The lines are neither.
    Correct!
    Follow Math Help Forum on Facebook and Google+

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