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Math Help - [SOLVED] Could someone tell me if my answers are correct please?

  1. #1
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    [SOLVED] Could someone tell me if my answers are correct please?

    Thanks in advance for your help!

    Find the slope and y-intercept of the following.

    y=3x-5

    My answer:
    slope=3, y-intercept=-5

    ----------
    Write an equation for the line with slope 1/3 and y-intercept 4.

    My answer:
    y=1/3x+4

    Write an equation for the line with slope 3 going through point (1,-2).

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

    I also need help getting the formula to solve a question:
    (I have already arrived at an answer, but I used logic and not a formula to get to it)

    One eighth of the square root of 7 less than a number is 2 what is the number?

    my answer:
    263

    I got to that answer by saying that if 2 was one eighth the square root of the number, minus seven, then 16=the square root and since 16^2=256 then the number must be 256+7=263

    Thank you again for your help!
    Drakmord
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  2. #2
    Senior Member Stroodle's Avatar
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    Quote Originally Posted by drakmord View Post

    Write an equation for the line with slope 3 going through point (1,-2).

    My answer:
    y=3x+(-2)
    You can use the formula y-y_1=m(x-x_2)

    So you have:

    y-(-2)=3(x-1)

    y+2=3x-3

    y=3x-5
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  3. #3
    Senior Member Stroodle's Avatar
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    Quote Originally Posted by drakmord View Post
    I also need help getting the formula to solve a question:
    (I have already arrived at an answer, but I used logic and not a formula to get to it)

    One eighth of the square root of 7 less than a number is 2 what is the number?
    \frac{1}{8}\times\sqrt{x-7}=2

    \sqrt{x-7}=16

    x-7=256

    x=263

    Your other answers are correct
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  4. #4
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    Thanks so much Stroodle!

    drakmord
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