(1) Required function is . (2) Slope of line is .
Step-by-step explanation:
1)
The function passing through (-3,9), (-1,3), (0,0) and (3,-9).
From these points it is noticed that the value of function decrease by 6 if the value of x increases by 2 and y-intercept is (0,0).
Slope intercept of a line is
Where, m is slope and b is y-intercept.
So, function is defined as
The required function is .
2)
It is given that the line joining two points (10, 9) and (40, 3).
Slope of line is
Therefore slope of line is .