this and half weigh less.) The line graph measures length in inches on the horizontal axis and weight in pounds

on the vertical axis. For example, point A on the figure shows that a boy who is 28 inches long will have a

median weight of about 19 pounds. One line on the graph shows the length-weight relationship for boys and

the other line shows the relationship for girls. This kind of graph is widely used by healthcare providers to

check whether a child’s physical development is roughly on track.

Access for free at openstax.org
A • The Use of Mathematics in Principles of Economics 507

FIGURE A3 The Length-Weight Relationship for American Boys and Girls The line graph shows the relationship

between height and weight for boys and girls from birth to 3 years. Point A, for example, shows that a boy of 28

inches in height (measured on the horizontal axis) is typically 19 pounds in weight (measured on the vertical axis).
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