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Chapter 5
Writing Linear Equations
    A continuation of Chapter 4
        Putting it all together
Focus is on the equation vs graphing
               P. 283
• Section 5.1 Write a linear equation in the
  Slope-Intercept Form

    when: given the slope and Y-intercept
    when: given the graph with the y-int.

 Remember: Slope-Intercept Form is
             y = mx + b, where m is the
 slope and b is the y-intercept.
• Remember: Slope-Intercept Form is
              y = mx + b, where m is the
  slope and b is the y-intercept. (0,b)

• y = 3/4x – 5

 slope is ¾ and the graph
          crosses y at (0,-5)
EXAMPLE 1     Use slope and y-intercept to write an equation

  Write an equation of the line with a slope of –2 and
  a y-intercept of 5.

     y = mx + b                  Write slope-intercept form.

     y = –2x + 5                 Substitute –2 for m and 5 for b.
GUIDED PRACTICE            for Examples 1 and 2

Write an equation of the line with the given slope
and y-intercept.
1. Slope is 8; y-intercept is –7.

 ANSWER       y = 8x – 7
EXAMPLE 2       Standardized Test Practice

 Which equation represents the line shown?
           2
 A    y=– x+3       B y = – 5x + 3
           5                 2
             2                        2
 C     y=–     x+1     D     y = 3x + 5
             5


 The slope of the line is rise = –2 = – 2 .
                          run    5      5
 The line crosses the y-axis at (0, 3). So, the
 y-intercept is 3.
      y = mx + b        Write slope-intercept form.

      y=– 2 x+3            Substitute – 2 for m and 3 for b.
          5                             5
EXAMPLE 3     Write an equation of a line given two points

 Write an equation of the line shown.




                                               Y = 4/3 x - 5
GUIDED PRACTICE           for Examples 3 and 4

 3.   Write an equation of the line shown.


  ANSWER        y=– 1 x+1
                    2
• New Goal Today – given the y-int. and one
  other point, how can you find the slope
  and then write the equation? (without
  graphing)
• Write the equation of a line that passes
  through the points (4,5) (0,-2).



• Find the slope using the slope formula.
• Use the slope and Y-int to write the
  equation.
• Write the equation of a line that passes
  through the points (4, -2) (0,-2).



• Find the slope using the slope formula.
• Use the slope and Y-int to write the
  equation.
• Write the equation of a line that passes
  through the points (-6, -1) and (0,3).



• Find the slope using the slope formula.
• Use the slope and Y-int to write the
  equation.
• A recording studio charges musicians an
  initial fee of $50 to record an album. In
  addition, studio time is $35 per hour.

• Write an equation that gives the total cost
  of an album as a function of studio time (in
  hours)
• Find the total cost of recording an album
  that takes 10 hour of studio time.
• f(x) = 35x + 50       T = 35h + 50

• f(10) = 35(10) + 50
• f(10) = $400
• Assignment: P. 286   1-20, 24-29, 45-46

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5.1 writing linear equations day 1

  • 1. Chapter 5 Writing Linear Equations A continuation of Chapter 4 Putting it all together Focus is on the equation vs graphing P. 283
  • 2. • Section 5.1 Write a linear equation in the Slope-Intercept Form when: given the slope and Y-intercept when: given the graph with the y-int. Remember: Slope-Intercept Form is y = mx + b, where m is the slope and b is the y-intercept.
  • 3. • Remember: Slope-Intercept Form is y = mx + b, where m is the slope and b is the y-intercept. (0,b) • y = 3/4x – 5 slope is ¾ and the graph crosses y at (0,-5)
  • 4. EXAMPLE 1 Use slope and y-intercept to write an equation Write an equation of the line with a slope of –2 and a y-intercept of 5. y = mx + b Write slope-intercept form. y = –2x + 5 Substitute –2 for m and 5 for b.
  • 5. GUIDED PRACTICE for Examples 1 and 2 Write an equation of the line with the given slope and y-intercept. 1. Slope is 8; y-intercept is –7. ANSWER y = 8x – 7
  • 6. EXAMPLE 2 Standardized Test Practice Which equation represents the line shown? 2 A y=– x+3 B y = – 5x + 3 5 2 2 2 C y=– x+1 D y = 3x + 5 5 The slope of the line is rise = –2 = – 2 . run 5 5 The line crosses the y-axis at (0, 3). So, the y-intercept is 3. y = mx + b Write slope-intercept form. y=– 2 x+3 Substitute – 2 for m and 3 for b. 5 5
  • 7. EXAMPLE 3 Write an equation of a line given two points Write an equation of the line shown. Y = 4/3 x - 5
  • 8. GUIDED PRACTICE for Examples 3 and 4 3. Write an equation of the line shown. ANSWER y=– 1 x+1 2
  • 9. • New Goal Today – given the y-int. and one other point, how can you find the slope and then write the equation? (without graphing)
  • 10. • Write the equation of a line that passes through the points (4,5) (0,-2). • Find the slope using the slope formula. • Use the slope and Y-int to write the equation.
  • 11. • Write the equation of a line that passes through the points (4, -2) (0,-2). • Find the slope using the slope formula. • Use the slope and Y-int to write the equation.
  • 12. • Write the equation of a line that passes through the points (-6, -1) and (0,3). • Find the slope using the slope formula. • Use the slope and Y-int to write the equation.
  • 13. • A recording studio charges musicians an initial fee of $50 to record an album. In addition, studio time is $35 per hour. • Write an equation that gives the total cost of an album as a function of studio time (in hours) • Find the total cost of recording an album that takes 10 hour of studio time.
  • 14. • f(x) = 35x + 50 T = 35h + 50 • f(10) = 35(10) + 50 • f(10) = $400
  • 15. • Assignment: P. 286 1-20, 24-29, 45-46