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Math Help - please someone help me with some algebra questions need someone smart?

  1. #1
    Newbie
    Joined
    Mar 2009
    Posts
    7

    please someone help me with some algebra questions need someone smart?

    Solve x + 3y = 7 if x and y must be whole numbers.
    (Points: 4)
    {(0, 5), (1, 3), (2, 1)}
    {(2, 1), (1, 4), (0, 7)}
    {(1, 2), (4, 1), (7, 0)}
    {(0, 5), (1, 4), (2, 1)}

    What is the slope of a line perpendicular to the line with equation y = 4x + 5
    (Points: 4)
    Option A: 4
    Option B: -4
    Option C: -1/4
    Option D: -5

    4. What is the slope of a line parallel to the line whose equation is 5x - 2y = 11
    (Points: 4)
    Option A: - 11/2
    Option B: -5/2
    Option C: -2/5
    Option D: 5/2

    5. Which of the following has a slope of 2 and a y-intercept of –4 (Points: 4)
    y = –2x + 4
    y = 2x + 4
    y = 2x – 4
    y = –2x – 4

    6. Which ordered pair is on the graph of the equation 3x + 7y = 11
    (Points: 4)
    (1, -2)
    (0,-4)
    (6, -1)
    (0, 4)
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  2. #2
    Newbie
    Joined
    Feb 2009
    Posts
    14
    1. The easiest thing to do would be to plug in x and y into the equation and see if the answer is 7. Example: Plug (0,5) in. 0 + 3(5)= 15. So that is not a correct answer.

    2. Lines perpendicular to each other have opposite slopes. So if a line had a slope of 4/5 a line perpendicular to it would have a slope of -5/4.

    4. Parallel lines have the same slope. You must change 5x - 2y = 11 into y= mx + b form, where m is the slope and b is the y-intercept.

    5. Use y= mx + b equation. m is the slope and b is the y-intercept.

    6. Use the same strategy as #1. Plug the points given to you into the equation and see if the outcome is 11.
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