Day 8 (4.2) Graph Linear Equations (by tables)
Solution: A solution is the value or values that make a mathematical sentence ___________________.
Which of the following ordered pairs is/are a solution(s) of 3x  y  7 ?
 
a) 3,4

b) 1, 4




c) 5, 3
d) 1, 10

What you may realize is that there are MANY ordered pairs that make that sentence true.
Can you think of another?
Coming up with ALL the ordered pairs is tough this way. Wouldn’t it be nice to have a way to come up with and
show all ordered pairs? Graph it!
Ex 1: Graph: -2x + y = -3
Step 1: Solve the equation for y.
Step 3: Plot the points.
Step 2: Make a table.
Ex 2: Graph: 4x + 2y = 4
Step 3: Plot the points.
Step 1: Solve the equation for y.
Step 2: Make a table.
TECH TID BIT  the Graphing Calculator.
Just for Funsies… (Stuff you should know)
1. Remind your partner how to change a decimal to a fraction
2. Show your partner the difference between the minus button and the negative button.
3. Show your partner where to find the square root button
NEW STUFF: Getting table values quickly by the graphing calculator
Our Equation: y – 2x = 1
Step 1: Solve the equation for y.
Step 2: Press the
button
Step 3: Enter your equation in
. Use the
button for your variable.
Step 4: Next, press
. This is how you access:
(note: any time you hit the blue button, it activates the blue words )
My screen looks like this:
Yours may not.
These are your ordered pairs!
If the table of values starts someplace strange, you can change that on this screen:
Use
to access
Where the table starts
How much it counts by
Leave these alone