Thank you I have now sorted my problem, thanks for all your help

natalie

thanks but it doesnt seem to be producing a graph

When i type in the display( [plotPP,plotEQ] ); line it just says:
 

display([PLOT(..),implicitplot([0=-4x+y+2, 0=2x-2y+3],x=-1..1, y=-1..1, color=green, thickness=2)])

not sure whats wrong

natalie