Y=-6x+5, and its intersection with the coordinate axis is (0,5) (5/6,0).
The area of the triangle is 1/2*5*5/6=25/ 12.
2
x-5y+ 17=20 ①
3x- 10y-20=- 16 ②
Multiply ① by 2.
2X- 10y+34=40 ③
③-②
-x+54=56
x=-2
Substitute (1)
y=- 1
3x+5y=2 1 ①
2x-3y=-5 ②
② Multiply by 3/2.
3x-9x/2=- 15/2 ③
①-③ Acquisition
19y/2=57/2
y=3
Substitute (1)
X=2
3.8W energy-saving lamp price X yuan, 24W energy-saving lamp price Y yuan.
Then 4x+3y=29, 2x+2y= 17.
The solution is x=3.5 and y=5.
8W energy-saving lamp price in 3.5 yuan, 24W energy-saving lamp price in 5 yuan.
China can save about 5000 * 2.3/850 = 65.438+35 billion yuan of electricity a year.
Carbon dioxide emission reduction is about 5000 * 43.5/850 = 2.559 million yuan.