2017­1­17 linear in 2 var. day 2.notebook
January 17, 2017
Today is Tuesday
1/17/17
Do Now:
-Take out HW from Thursday
-Take calculator and ruler
-Copy down tonight's HW
-Graphing Lines W.S.
-Quiz on Friday 1/20
extra help Friday @ 7:20
Warm UP: Fill in the tables
1. y = 2x − 3
2. y = −x + 1
3. y = x + 5 4. y = 2017­1­17 linear in 2 var. day 2.notebook
January 17, 2017
HW Answers
Today's Objective:
More Practice With Linear Equations in 2
Variables
2017­1­17 linear in 2 var. day 2.notebook
Work with a partner.
a. Use the equation y = complete the table. (Choose any
two x­values between ­6 and 6
and find the y­values.)
b. Write the two ordered pairs given by the table. These are called solution points of the equation.
c. PRECISION Plot the two solution
points. Use a ruler to draw a line exactly through the two points.
d. Find a different point on the line. Check that this point is a solution point of the equation y = ? e. LOGIC Do you think it is true that any point on the line is a solution point of the equation y = ? Explain.
f. Choose five additional x­values for the table. (Choose positive and negative x­values.) Plot the five corresponding solution points. Does each point lie on the line?
January 17, 2017
2017­1­17 linear in 2 var. day 2.notebook
January 17, 2017
g. LOGIC Do you think it is true that any solution point of the equation
is a point on the line? Explain.
h. Why do you think y = ax + b is called a linear equation?
Find three ordered pairs that are solutions of the equation y = 2x − 3.
Draw the graph.
x
y
Based on the graph, is (-3,-9) a solution? Is (6,8) a solution?
2017­1­17 linear in 2 var. day 2.notebook
January 17, 2017
Are the following coordinate pairs solutions
to the equation 4x + 2y = 6?
a) (2, ­1) b) (3, 0) c) (0, 3)
Find 3 solutions to the equation 3x + y = 9
Write your answers as coordinate pairs.
2017­1­17 linear in 2 var. day 2.notebook
Graph y = −2x + 1.
x
y
January 17, 2017