September 09, 2016
Friday 9/9/16
Slope Intercept form
September 09, 2016
p. 202 #20-30 even, 37-40
20. y - 8 = 4(x + 4)
22. y + 5 = 5/7 (x + 2)
24. y + 12 = -2.4(x - 14)
26. x = 2
28. y - 5 = -2/3(x - 0) or y - 3 = -2/3(x - 3)
30. y - 4 = 5/2 (x - 2) or y + 11 = 5/2 (x + 4)
September 09, 2016
37. y + 4 = -2(x + 7)
38. y = -10
39. y - 2 = -2/3 (x - 6)
40. y - 2 = 1/5 (x + 2)
p. 203 48, 49
48. perpendicular
49. neither
September 09, 2016
Slope-Intercept Form:
Example 1:
Remember _____ points form
exactly one line!
x
y
1
1
-1
-5
slope =
y-intercept =
Equation in slope-intercept form
September 09, 2016
Example 2:
Write the equation y + 6 = -3(x - 5) in slope-intercept form
September 09, 2016
Example 3:
Write an equation of a line containing (-7, 4) and (9, -4) in
point-slope form, then convert it into slope-intercept form.
September 09, 2016
Example 4:
Write an equation of a line perpendicular to the line
y = -3x + 6, and passing through the point (-4, 3) in point-slope
form, then convert it into slope-intercept form.
September 09, 2016
Example 5:
Identify the slope and a point on the line whose equations in
point-slope form is y-2 = 4(x + 7). Then, convert it into slopeintercept form.
slope:
point:
September 09, 2016
Example 6:
Write an equation of a line that passes through (-2, 8) and is
perpendicular to the line y + 3 = 2(x - 5) in point-slope form and
then convert it into slope-intercept form.
September 09, 2016
Example 7:
A plumber charges a fee of $50 to make a house call and then
charges $25.00 an hour for labor.
a. Identify the variables in this situation: _____________
depends on _________________
x = ___________
y = ____________
b. Determine
y-intercept: __________ slope _________
slope-intercept form of the equation
__________________________
c. Use your equation to determine how many hours the plumber
worked if you were charged $175.00
d. Use your equation to determine how much will you have to
pay the plumber he works for 3 hours.
September 09, 2016
Example 8:
Max borrowed $450 from his mom to buy an iPad. He promised
to pay her back $25 per month until he paid back all of the
money.
a. Write an equation to represent the amount of money Max still
owes his mom.
b. Use your equation to show how much money Max will owe
his mom after 1 year.
c. Use your equation to determine how many months it will
take Max to repay all the money.
September 09, 2016
Assignment: Worksheet
September 09, 2016