How to Use the Desmos Graphing Calculator to graph Cost and Revenue Equations.
Rebecca Owen
25 steps
2 minutes
Google
Desmos
1
Navigate to [https://www.desmos.com/](https://www.desmos.com/)
2
Click "Graphing Calculator"
3
Click in the first box.
4
Type "C(x)=0.85x+35000"
5
Click into the second box.
6
Type "R(x)=1.55x"
7
Click inside the graph.
8
Zoom out until you can see both lines on the graph. You can drag the graph so you can see the point of intersection for the lines.
9
Click on one of the two equations in the boxes on the left. A gray dot will appear on the intersection point of the two graphs.
10
Hovering over the gray dot will show the intersection point.
11
The break-even point is at 50,000 units and $77, 500.
12
To calculate loss at 25,000 units, we need to evaluate the cost and revenue functions at 25,000 units.
13
Click in box 3.
14
Type "C(25000)"
15
Click in box 4.
16
Type "R(25000)"
17
Click in box 5.
18
Subtract the revenue from the cost to determine the loss at 25,000 units. Type "56250-38750". The loss at 25,000 units is $17,500.
19
To calculate profit at 70,000 units, we need to evaluate the cost and revenue functions at 70,000 units.
20
Click in box 5.
21
Type "C(70000)"
22
Click in box 6.
23
Type "R(70000)"
24
Click in box 7.
25
Subtract the cost from the revenue to determine the profit at 70,000 units. Type "108500-94500". The profit at 70,000 units is $14,000.
How to Use the Desmos Graphing Calculator to graph Cost and Revenue Equations.
Rebecca Owen
25 steps
2 minutes
Google
Desmos
1
Navigate to [https://www.desmos.com/](https://www.desmos.com/)
2
Click "Graphing Calculator"
3
Click in the first box.
4
Type "C(x)=0.85x+35000"
5
Click into the second box.
6
Type "R(x)=1.55x"
7
Click inside the graph.
8
Zoom out until you can see both lines on the graph. You can drag the graph so you can see the point of intersection for the lines.
9
Click on one of the two equations in the boxes on the left. A gray dot will appear on the intersection point of the two graphs.
10
Hovering over the gray dot will show the intersection point.
11
The break-even point is at 50,000 units and $77, 500.
12
To calculate loss at 25,000 units, we need to evaluate the cost and revenue functions at 25,000 units.
13
Click in box 3.
14
Type "C(25000)"
15
Click in box 4.
16
Type "R(25000)"
17
Click in box 5.
18
Subtract the revenue from the cost to determine the loss at 25,000 units. Type "56250-38750". The loss at 25,000 units is $17,500.
19
To calculate profit at 70,000 units, we need to evaluate the cost and revenue functions at 70,000 units.
20
Click in box 5.
21
Type "C(70000)"
22
Click in box 6.
23
Type "R(70000)"
24
Click in box 7.
25
Subtract the cost from the revenue to determine the profit at 70,000 units. Type "108500-94500". The profit at 70,000 units is $14,000.
