Help plotting parametric equations

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Im trying to plot a parametric equation given by X= 3t/(1+t3) and Y= 3t2/(1+t3), on two intervals in the same window, the intervals are -30≤ t≤ -1.6 and -0.6≤ t≤ 40 I need to use the plot function to plot this My code for the first interval of t is

    t= linspace (-30,-1.6);
    X= ((3*t)/(1+t.^3);
    Y= ((3*t.^2)/(1+t.^3));
    plot(x,y)

When i try to plot this interval, it just draws up a blank graph, with no function plotted. What am i doing wrong, and also, how would i go about plotting the same function on the second interval, and have both plots visible in the same window of the plot? Any help is greatly appreciated, i apologize for any stupid errors, this is my first time using matlab

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Melodee Haney 2017-9-20

One thing that I see is that the functions are defined with capital letters 'X' and 'Y', but then a plot is attempted with lower case letters 'x' and 'y'.

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