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Math Help - Finding both x and y intercept

  1. #1
    Junior Member
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    Finding both x and y intercept

    ok, well the book give this example
    2x-3y=6
    which gives me
    x=3
    y=-2

    But my homework question, doesnt seem to work and I have no examples to help.

    Find both x-intercept and y-interceptof the given equation.

    7x-8y+6=0

    7x-8*0+6=0
    7x+6=0
    -6 -6
    7x=-6
    /7 /7
    x=-6/7

    7*0-8y+6=0
    -8y+6=0
    -6 -6
    -8y=-6
    /-8 /-8
    y=-6/8

    So I would have
    x-intercept (-6/7,0)
    y-intercept (0,-6/8)

    This doesn't look correct.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by GeinoD View Post
    ok, well the book give this example
    2x-3y=6
    which gives me
    x=3
    y=-2

    But my homework question, doesnt seem to work and I have no examples to help.

    Find both x-intercept and y-interceptof the given equation.

    7x-8y+6=0

    7x-8*0+6=0
    7x+6=0
    -6 -6
    7x=-6
    /7 /7
    x=-6/7

    7*0-8y+6=0
    -8y+6=0
    -6 -6
    -8y=-6
    /-8 /-8
    y=-6/8

    So I would have
    x-intercept (-6/7,0)
    y-intercept (0,-6/8)

    This doesn't look correct.
    your y intercept is wrong (watch your signs. what sign should the result be if we divide a negative number by a negative number?) other than that, you're good
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  3. #3
    Junior Member
    Joined
    Jan 2008
    Posts
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    It should have been positive. I get that confused all the time.
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