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Math Help - Graph a equation

  1. #1
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    Graph a equation

    Hello,
    I was wondering whether someone could give me a heads up on this one. I need to rearrange this in terms of x, so this can be plotted on the x and y axis. See attachment. Both Q 13 and 14 would be good or just one....they are similar

    Thankyou in advance

    Tren301
    Attached Thumbnails Attached Thumbnails Graph a equation-vwex8ubhmk7uf0dpxbe19daq-2-.jpg  
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  2. #2
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    Re: Graph a equation

    Quote Originally Posted by Tren301 View Post
    Hello,
    I was wondering whether someone could give me a heads up on this one. I need to rearrange this in terms of x, so this can be plotted on the x and y axis. See attachment. Both Q 13 and 14 would be good or just one....they are similar

    Thankyou in advance

    Tren301
    for (13) you can solve for h in your second equation to get h=10-\frac{r}{3} and then plug that into the formula for volume

    V=\pi r^2(10-\frac{r}{3})

    you can go to wolframalpha.com and type in

    Plot[Pi r^2(10-r/3),{r,0,31}] and play with the range of r to find your maximum.

    do the same thing for (14), just solve for y, y=\frac{100}{x} and plug that into the other equation.
    and plot it similar to above.
    Thanks from Tren301
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