Question: plot three dimensional curve using data points

Dear all

I need your help to plot

1)   First:  a three dimensionl curve, that is plot F(X,Y), where X, Y, and F(X,y) is given

2) Second: can plot all the curves in the same graph ( 2-dimensional curve)  obtained from the following idea 
for j from 0 by 5 to 40
plot( F(X,j), X)
end for

thank you for your help

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