Sewanhaka High School
Math 8
Name:__________________________
Mrs. Lidowsky, Principal
Mr. Long, Teacher
Per:____
Date:_____________________
H.W. #23: Ditto
DO-NOW #23: Answer the following questions:
1) Make a table for and graph the following equation:
x y = -3x + 2 y (x, y)
2) Find the slope of the line y = -3x + 2:
3
2
3) Multiply: 3  2 =
4
5
Topic: Expressions and Equations
Main Idea: Finding the Slope and y-intercept of a line
Aim:
Recall
Notes
Go back to DO-NOW questions 1 and 2
How can you tell the slope of the line y = -3x + 2 from its
equation?
Where does the line y = -3x + 2 intercept (or cross) the
y-axis?
What can we say about the value of 2 in the equation
y = -3x + 2?
Find the slope and y-intercept of the line that is the graph
of the equation:
a) y = -2x + 5
b) y = 3x + 5
c) y = 2x
d) y = ½ x – 10
e) y = 4 – 3x
What if the equation is not in the form y = mx +b? How
would you find the slope and y- intercept of 2y = 4x + 10?
Find the slope and y-intercept of the line that is the graph
of the equation 2x = 5y - 10
y = -3x + 2
Recall
What is the slope and y-intercept of 2x + y = 10?
If you are given an equation and know how to find its
slope and y-intercept, then how would you develop an
equation if given the slope and y-intercept? For example,
2
the slope (m) = and the y-intercept (b) = 1.
3
1
Write an equation of a line whose slope is
and
2
y-intercept is –4.
4
Write an equation of a line whose slope is - and y3
intercept is 0.
Drill: Answer the following questions. Show work.
Summary:
Notes