x+y=30
4.5x+2y≤ 1 15
1.5x+5y≤80
Establish a coordinate system with O (0 0,0) as the origin, as shown in the figure. The feasible solution region is a triangle surrounded by graphs, where the feasible solution is
(20, 10),(2 1,9),(22,8)
So, there are three production schemes.
(2) Let the total cost be W, then
w= 1.2x+ 1.8y
? =54? -? 0.6 times
Therefore, the greater the x, the smaller the total cost, so take x = 22.
W=40.8 at this time.
220,000 A bricks and 80,000 B bricks were produced, and the lowest cost was 408,000 yuan.