# Supply and Demand Activity Sheet Answers ```Supply and Demand Activity Sheet Answers
Activity Sheet 1: Senior Class Buttons
The graph should resemble the following:
3. about 150 customers; by examining quantity when the cost is \$2.50
4. about 140 customers; at \$3.80 the supply is 300 and the demand is 160, so there are 140
unsold buttons
5. about 660 buttons; that is the y-intercept of the demand line
6. about \$0.60; that is the x-intercept for the supply line
7. Equilibrium is at about \$3.20, because that is the price where the supply and demand lines
intersect.
8. S = 95P – 60
9. D = –130P + 660
10. P = \$3.20; 244 buttons
© 2008 National Council of Teachers of Mathematics
http://illuminations.nctm.org
Activity Sheet 2
Game Cartridges
1. S = 10P – 50
2. D = –10P + 700
3. \$37.50
Silver Dollars
The graph should resemble the following:
3. about \$2.60
6. Based on the graph shown in the answers, the lines intersect at about (\$2.50, 47). The xcoordinate of the intersection point should be close to the answer to Question 3. Student answers
will vary depending on whether they try to fit a line to each set of data or possibly connect the
points and make a line graph.
© 2008 National Council of Teachers of Mathematics
http://illuminations.nctm.org
```
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