im learning about contour diagrams in my calculus text but im totally confused as to how one should start drawing those plots?(adsbygoogle = window.adsbygoogle || []).push({});

for example f(x,y) = x+y

then its supposed to go like

x+y = c

y = -x +c

^^i can see that the slope is 1

but how do i plot this graph?..im told that i should give values to c and plot it...but im totally confused as to how i should do that (the answer is there too but i donno how they drew the graph/which method they used to draw it)

also im totally confused as to how one can draw a contour diagram from the data given in a table

table of values for f(x,y) = X^2 - Y^2

i have attached the table here too

thank you

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# Plotting contour diagrams? how do i do that?

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