1. Warm up 20 Find the slope: 1.) (4,0) (5,7) 2.) (-3,3) (-3, -2)
3.) (3/4, ½) ( 1/4, -1/2)
4.)(-3,4) (2,4)

2. 7.5 Equations and Slope Objective goal:
1.) To find slope and y-inercept of a line from an equation
2.)To graph lines using the slope-intercept equation

3. Slope-intercept equation y = mx + b
y-intercept

4. To find the slope (m) and y-intercept of an equation:
Write the equation in the y-intercept form
Solve for “y”
y = mx + b
“m” is the slope
“b” is the y-intercept

5. Find the slope and y-intercept of y = -5x + 6

6. Find the slope and y-intercept of 2y = 7x - 4

7. Find the slope and y-intercept of 2x + 3y = 6
3y = - 2x + 6 3 3 3

8. Find the slope and y-intercept of -7x - 5y = 25
-5y = 7x + 25 -5 -5 -5

9. Going the other direction…
Given slope and the y intercept write your equation in slope-intercept form (y=mx+b)
1.) m=3, b=-2
Y=3x+-2
2.) m=0, b= -5
Y= -5
3.) m=1/2, b= 1
Y=1/2 x +1

10. Steps To Graph Using y=mx+b Slope Intercept From:
1.) Solve for y so your equation is in y=mx+b format
2.) Plot your b (y-intercept) on the y-axis
3.) From your y intercept use your slope to go up and over depending on the rise over run of your slope and plot your 2nd point.(If your slope is – you go down and to the right, if it is + you go up and to the right)
4.) Now that you have 2 points draw your line

11. Using y-intercept and slope, graph:

12. Using y-intercept and slope, graph:

13. Using y-intercept and slope, graph:

14. In closing…. We now have three methods to graph linear equations:
1.) 7.2 making a table and plotting three points
2.) 7.3 finding the x and y intercepts and plot two points
3.) 7.5 Putting the equation in slope intercept form and graphing the y intercept then use the slope to find the second point

15. Assignment Page 326 20-50 (even) on graph paper