2. WARM UP SOLVING EQUATIIONS Solve the equation. (lesson 3.3) 1.8 + y = 3 2.y – 9 = 2 3.6(x + 15) = 120 4.2(x + 5) =18 4

3. WARM UP SOLVING EQUATIIONS Solve the equation. (lesson 3.3) 1.8 + y = 3 2.y – 9 = 2 3.6(x + 15) = 120 4.2(x + 5) =18 3

4. WARM UP SOLVING EQUATIIONS Solve the equation. (lesson 3.3) 1.8 + y = 3 2.y – 9 = 2 3.6(x + 15) = 120 4.2(x + 5) =18 2

5. WARM UP SOLVING EQUATIIONS Solve the equation. (lesson 3.3) 1.8 + y = 3 2.y – 9 = 2 3.6(x + 15) = 120 4.2(x + 5) =18 1

6. SOLVING EQUATIIONS Solve the equation. (lesson 3.3) 1.8 + y = 3 2.y – 9 = 2 3.6(x + 15) = 120 4.2(x + 5) =18 WARM UP 0 CERTIFIED

7. 5.4 Standard Form Wha two ‘spect in the nex 6 daze! 2/3 5.4b 2/4 5.3 – 5.4 Review 2/5 Quiz 2/6 5.6 2/7 Unit 5 Review 2/10 Unit 5 Test

8. 5.4 Standard Form Today’s Schedule: Lesson 5.4 Powerpoint Lesson 5.4 Powerpoint In class assignment/homework In class assignment/homework GOAL: Write an equation of a line in standard form. KEY WORDS Standard form Slope-intercept form Point-slope form Integer coefficient

9. 5.4 Standard Form STANDARD FORM The STANDARD FORM of an equation of a line is: Ax + By = C Where A and B are integers (not fractions) and not both zero.

10. 5.4 Standard Form EXAMPLE 3 Write an Equation in Standard Form A line intersects the axes at (4, 0) and (0, 3). Write the equation of the line in standard form. SOLUTION 1.Find the slope. m = y 2 – y 1 x 2 - x 1

11. 5.4 Standard Form EXAMPLE 3 Write an Equation in Standard Form A line intersects the axes at (4, 0) and (0, 3). Write the equation of the line in standard form. SOLUTION 2.Write an equation of the line using slope-intercept form. y = mx + b

12. 5.4 Standard Form EXAMPLE 3

13. 5.4 Standard Form PRACTICE Write in standard form an equation of the line that intersects the axes at (2,0) and (0,5)

14. 5.4 Standard Form HORIZONTAL AND VERTICAL LINES Recall from Lesson 4.5 that the slope of a horizontal line is ZERO and the slope of a vertical line is UNDEFINED. In example 4 you will learn how to write equations of horizontal and vertical lines in standard form.

15. 5.4 Standard Form EXAMPLE 4 Equations of Horizontal and Vertical Lines Write an equation of the RED line in standard form. SOLUTION Each point on this horizontal line has a y-coordinate of -3. So, the Equation of the line is y = -3. This equation is in STANDARD FORM

16. 5.4 Standard Form EXAMPLE 4 Equations of Horizontal and Vertical Lines Write an equation of the RED line in standard form. SOLUTION Each point on this vertical line has a x-coordinate of 2. So, the Equation of the line is x = 2. This equation is in STANDARD FORM

17. 5.4 Standard Form PRACTICE Write an equation of the line in standard form.

18. 5.4 Standard Form PRACTICE Write an equation of the line in standard form.

19. 5.4 Standard Form YOUR TURN Page 295 #s 30-44