2 answer to question 9

2 answer to question 9

9、(1)S=1/2*6(8-x)
=-3x+24(0<x<8)
(2) When x = 5, s = - 3 * 5 + 24 = 9
(3) No, the function s decreases as x increases
∵ point P (x.y) is in the first quadrant,
x>0 x