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    dimitri06's Avatar
    dimitri06 Posts: 39, Reputation: 3
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    #1

    Jan 11, 2006, 06:02 PM
    math problems
    Do all of these problems in good detail please!

    Dan has $160 to spend on t-shirts and shorts for his new wardrobe. T-shirts cost $8 a shirt and shorts cost $16 a piar. Write a inequality and solve.

    next..

    Find the value of r so that the line that passes through (-4, 3) and (2, r) has a slope of m= 2/3.



    That's all folks!! Thanks
    DrJ's Avatar
    DrJ Posts: 1,328, Reputation: 339
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    #2

    Jan 11, 2006, 06:31 PM
    Ya got me on the inequality one... I forget how to do that.



    and its been a while on graphs but I think r = 6

    I don't know how you show your work on that one but I would just graph it out. Start with the first point (-4, 3) follow the slope till the x axis hits 2... your y axis should be at 6 at that point
    reinsuranc's Avatar
    reinsuranc Posts: 92, Reputation: 6
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    #3

    Jan 14, 2006, 01:38 PM
    Find the value of r
    Find the value of r so that the line that passes through (-4, 3) and (2, r) has a slope of m= 2/3.

    If (x1,y1) and (x2,y2) are two points, then the slope of the straight line that connects the points equals:
    (y2 - y1)/(x2 - x1).

    2/3 = (r - 3)/(2 - -4) = (r - 3)/6

    12/3 = r - 3

    r = 7
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