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Math Help - GR9 Math Exam Review

  1. #1
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    GR9 Math Exam Review

    How would i find the x intercept of the following:

    a) y=-5
    b) y=-3x+9
    c) 2x+3y-6=0
    d) x=-4

    Thanks guys!
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  2. #2
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    To find the x-intercept, set y to 0.

    a) This one has no x-intercept, y is always -5 so it never crosses the x axis (which is defined by y=0).

    b) 0=-3x+9
    3x=9
    x=3

    So the x intercept is (3,0) or just 3.

    c) 2x+3(0)-6=0
    2x-6=0
    2x=6
    x=3

    Same answer as b).

    d) x is always equal to -4 regardless of y, so the x intercept is (-4,0).

    Hope that helps.
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  3. #3
    Junior Member ursa's Avatar
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    How would i find the x intercept of the following:

    a)
    b)
    c)
    d)

    Thanks guys!
    hi
    In a.) line is parallel to x-axis
    In b.) and c.) put y=0
    In d.) answer is in the question
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  4. #4
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    Quote Originally Posted by JD-Styles View Post
    To find the x-intercept, set y to 0.

    a) This one has no x-intercept, y is always -5 so it never crosses the x axis (which is defined by y=0).

    b) 0=-3x+9
    3x=9
    x=3

    So the x intercept is (3,0) or just 3.

    c) 2x+3(0)-6=0
    2x-6=0
    2x=6
    x=3

    Same answer as b).

    d) x is always equal to -4 regardless of y, so the x intercept is (-4,0).

    Hope that helps.

    Thanks alot you guyz! I just have one more thing... what would be the y-int for d then?
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  5. #5
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    Quote Originally Posted by princevisram View Post
    Thanks alot you guyz! I just have one more thing... what would be the y-int for d then?
    There is none. For the y intercept we need x=0 so it cannot intersect with x=-4.
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  6. #6
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    Quote Originally Posted by JD-Styles View Post
    There is none. For the y intercept we need x=0 so it cannot intersect with x=-4.
    K Thanks... 1 more question

    in y=mx+b form, how would you write y+3x=10?

    would it be y=3x-10 or y=3x+10?
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  7. #7
    Member TheMasterMind's Avatar
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    Quote Originally Posted by princevisram View Post
    K Thanks... 1 more question

    in y=mx+b form, how would you write y+3x=10?

    would it be y=3x-10 or y=3x+10?
    y=-3x+10
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  8. #8
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    y=-3x+10
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  9. #9
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    Quote Originally Posted by JD-Styles View Post
    y=-3x+10
    Now, what about 2t-d+10=0? How do you know which one is y and which one is slope?
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  10. #10
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    Quote Originally Posted by princevisram View Post
    Now, what about 2t-d+10=0? How do you know which one is y and which one is slope?
    Depends on what t and d represent. I would assume that t stands for time and d stands for distance, in which case d would be you dependent variable (y).

    y is always the variable that depends on the other one. For example if I had the equation p-3s-5=0, where p is the profit and s is the number of sales, well obviously my profit depends on the number of sales so p=y and s=x so I'd write p=3s+5.

    Hope that all makes sense.
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  11. #11
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    Quote Originally Posted by JD-Styles View Post
    Depends on what t and d represent. I would assume that t stands for time and d stands for distance, in which case d would be you dependent variable (y).

    y is always the variable that depends on the other one. For example if I had the equation p-3s-5=0, where p is the profit and s is the number of sales, well obviously my profit depends on the number of sales so p=y and s=x so I'd write p=3s+5.

    Hope that all makes sense.
    You are sooo amazing!
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