Name ___________________________________

Graphing Calculator Activity

Equations of Lines

Instructions:

1. Put a "friendly window" into the RANGE of your calculator.

## Xmin: -9.4 Ymin: -6.2

Xmax: 9.6 Ymax: 6.4

Xscl: 1 Yscl: 1

2. Graph each equation.

3. Use TRACE to find whole numbers for (x1, y1) and (x2, y2).

4. Calculate y2-y1 and x2-x1.

5. Calculate the slope using the equation slope = (y2-y1)/(x2-x1).

6. TRACE to find the Y-intercept.

Equation ....(x1,y1)....(x2,y2) ....y2-y1 ...x2-x1 ..Slope ...Y-Intercept

1. y = 2x

2. y = .5x + 3.5

3. y = -3x - 2

4. y = (-3/4)x + 4

5. y = 3x - 2

6. y = (2/3)x + 1

7. y = (-1/2)x - 4

8. 2x + 3y = 6

Compare the slope that you found with its equation. Where is it

always located? ________________________________________

Now compare the y-intercept and its equation. Where is it always located? ______________________________________________

What about the location of slope and y-intercept in the equation

2x + 3y = 6 ?

______________________________________________________