(2).A: y=- 12.5x+25(0≤x≤2)
B: y=-8x+20(0≤x≤2.5)
(Just write the function expression according to the figure, and note the value range of X)
(3) When x= 10/9, the heights of Party A and Party B are equal, both of which are 100/9 (only-12.5x+25 = -8x+20).
When 0; -8x+20 is enough)
When 10/9
The above three results can also be seen from the image that when the line segment of A is higher than B, A is higher than B, and vice versa, the x corresponding to the intersection of two line segments is 10/9.