Question 557751
 h  ----------$100 bills and 
t----------- $20 bills 

total $400

100h + 20t =400.............(1)

/20
5h+t=20

t= 20-5h

plot the points for various values of h

h=0, t=20 (0,20)
h=10,t=30( 4,0)

{{{drawing(500,500,-10,10,-10,100,circle(0,20,0.3),circle(4,0,0.3),grid(1),graph(500,500,-10,10,-10,100,y=-5x+20))}}}

X axis hundreds
y axis tens
when x=4 y=0 
when x=0, y=20
so you can find relation between x & y

m.ananth@hotmail.ca