Question

1. Find the slope for the values in the table below.
x, -1, 0, 1, 2
y, 5, 3, 1, -1
A. 1
B. -1
C. 2
D. -2
2. What is the slope for the following table of values? The table represents the total amount spent in a paperback book club after an introductory fee of $12.

# books purchased: 1/ 2/ 3 / 4
Cost of book club: 21/30/39/48

A. 3
B. 5
C. 7
D. 9

Answer 1

1/ slope is defined by the derived of the function or dy/dx = -2/1 = -2 (if you draw the line you can see that the y value decreases 2 each time the x value increases 1 )
so answer D)
2/ again the slope is the amount paid for one book : (48-12)/4 = 9
and (39-12)/3 = 9 and so on or you calculate the slope directly from its definition of the slope of a function slope = dy/dx = (48 - 21)/(4-1)=9
so answer D)