If slope = -2 for a line on a graph with x on the horizontal axis and y on the vertical axis, then ...

If slope = -2 for a line on a graph with x on the horizontal axis and y on the vertical axis, then if
 a. x increases by 4, y increases by 8
  b. x increases by 4, y increases by 2
  c. y increases by 4, x increases by 8
  d. x = 4, y = 8
  e. x increases by 4, y decreases by 8

QUESTION 2

Suppose the cost of producing copper tubing is 1 per foot. If production costs were measured on the vertical axis and quantity of copper tubing were measured on the horizontal axis, which of the following lines would have the smallest slope?
 a. a line representing the quantity of tubing measured in inches
  b. a line representing the quantity of tubing measured in feet
  c. a line representing the quantity of tubing measured in yards
  d. the 45-degree line
  e. any vertical line

QUESTION 3

One economic application of the slope of a line is
 a. measuring unlimited wants
  b. behavioral analysis
  c. marginal analysis
  d. allocative efficiency
  e. rational self-interest

QUESTION 4

The slope of a line
 a. can only be calculated for straight lines
  b. varies at different points along a straight line
  c. indicates whether or not there is a causal relationship between variables
  d. is independent of the units of measurement used
  e. indicates how much the vertical variable changes for a given change in the horizontal variable

QUESTION 5

The numerical value of the slope of a line depends in part on the units of measurement used.
 a. True
  b. False

QUESTION 6

Ron weighs 150 pounds. A graph relating Ron's weight on the vertical axis to Nancy's consumption of ice cream on the horizontal axis would be
 a. a horizontal line at weight = 150
  b. a horizontal line at weight = 0
  c. a positively sloped line with decreasing slope
  d. a vertical line at weight = 150
  e. the origin

QUESTION 7

Suppose a graph with Ron's weight on the vertical axis and his consumption of ice cream on the horizontal axis indicated that for each serving of ice cream he ate, Ron would gain 3 pounds, regardless of how much ice cream he had already eaten. This graph would show a
 a. horizontal line at weight = 3
  b. straight line with slope = 3
  c. straight line with slope = 1/2
  d. straight line with slope = -3
  e. straight line with slope = -1/3