Question

find the slope of the line that passes thru points (1980,16000) and (2000,43000)

Answer 1

m(slope)= change in y/change in x
m=(43000-16000)/(2000-1980), dont have a calculator so slove it your self. Note i have assumed that (2000,43000) is the second point.

Answer 2

Slope of the line passing through the points (x1,y1) & (x2,y2) is given by the formula
\[\Large slope = \frac{y2-y1}{x2-x1}\]

Answer 3

Here (x1,y1) = (1980,16000)
(x2,y2) = (2000,43000)

that means
x1 = 1980
y1 = 16000
x2 = 2000
y2 = 43000

Now substitute it to the formula \[\large Slope = \frac{y2-y2}{x2-x1}\]

posideon is completely right!