linear graphical method programming
 

hello..i wanted to plot a graph with teh equation z=2.5x + 2 y
with teh following constarints x+y <=450,000 ; x = 200,000 ; y = 150
the get the 3 points of intersection to get the maximim (Z) i can have.
i guess it can be done by teh Solver..but i couldnt do the right inputs.
plus i need it solved graphically an i gues sthe solver just solve it
mathemtaically.
plz email me on melwakkad1@hotmail with the answers.thanks