Question 966875
A school wants to purchase some round tables and some rectangular tables.
 The costs of one of one round table and one rectangular table are $20 and $25, respectively.
 The school wants to spend at most $1000.
 Represent this problem for the purchase of x round tables and y rectangular tables graphically. 
:
let x = no. of round tables
let y = no. of rect tables
then
20x + 25y =< 1000
put the equation in the slope intercept form
25y =< -20x + 1000
divide by 25
y =< -.8x + 40
plot this equation, let's use x=10, x=30
 x | y
------
10 | 32
30 | 16 
{{{ graph( 300, 200, -19, 60, -10, 60, -.8x+40, 20) }}}
Area of feasibility at or below the line
For example, if you get 25 round tables, you can get 20 rect tables, (green line)
25 * $20 = 500
20 * $25 = 500
---------------
total is $1000 
:
:
Make sense??