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{SECT 0 {EXCHG {PARA 18 "" 0 "" {TEXT -1 17 "Level Curves 11.1" }}
{PARA 0 "" 0 "" {TEXT -1 9 "Example: " }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 12 "with(plots):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 
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{MPLTEXT 1 0 42 "plot3d(f(x,y),x=-5..5,y=-5..5,axes=BOXED);" }}}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 73 "contourplot(f(x,y),x=-5..5,y
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" 0 "" {MPLTEXT 1 0 39 "implicitplot(f(x,y)=0,x=-2..2,y=-2..2);" }}}
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}}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 9 "Example: " }}}{EXCHG {PARA 0 "" 
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}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 42 "plot3d(f(x,y),x=-5..5,y=-5.
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{MPLTEXT 1 0 42 "plot3d(f(x,y),x=-5..5,y=-5..5,axes=BOXED);" }}}
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