4 7 Notes A
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Day 2: Opener
Think back:
Complete the following problem on a math raffle ticket.
Good Luck!1. Write the equation of the line that is parallel to x = ‐6 and passes through the point (3,10).
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Homework Questions:
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Section 4.7 Jiffy Graphs
Solve your given equation for y.TOPIC ONE (cont.)Information from Equations
Think back: Are these equations equivalent? How do you know?
Since they are equivalent then they should all be the same line! This means they should all have the same __________, ________________, and ___________.
It's Your Turn!
Complete the following 4 questions with your partner.(5 minutes)
1. What is the slope of line l ?
2. Where does l cross the y‐axis?
3. Where does l cross the x‐axis?
4. Which equation for l makes it easiest to see that the point (5,3) is on the line? Explain.
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Linear Equation Forms Point‐Slope Form (IYT # 1 & 4):•
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Slope‐Intercept Form (IYT # 1 & 2):•
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Standard Form (IYT # 3):•
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TOPIC TWOWriting equations of lines using the different forms.
Given slope and through the given point: (Ex. #1)
(10, ‐3) with slope 7
Step 1: Substitute the given information into point‐slope form.
Step 2: Simplify to slope‐intercept form (solve for y).
(0,7) and (‐4,9)
Step 1: Find the slope between these 2 points.
Step 2: Substitute one of the points and the slope into point‐slope form.
Step 3: Simplify to slope‐intercept form (solve for y).
We can use the different forms of linear equations that we learned today to write the equation of a line in a jiffy!
Given 2 points: (Ex. # 2)
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TOPIC THREEJiffy Graphing
Think back: How did we graph equations last chapter?
We are going to use the forms of linear equations to help us graph in a jiffy!
Using Point‐Slope Form: (Ex. # 3)
Graph y+2 = ‐3(x+1).
Step 1: Plot the given point.
Step 2: Use the slope to plot two more points.
Step 3: Connect all three points with a line.
Using Slope‐Intercept Form: (Ex.#4)
Graph y = 1.75x ‐1.
Step 1: Plot your y‐intercept.
Step 2: Use the slope to plot two more points.
Step 3: Connect all three points with a line.
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Exit Slip: 1.) Think about how you might graph the equation of a line given to you in standard form. Write down what your method would be on a half‐sheet of paper and turn it in before you leave.
2.) Graph 3x+4y = 12 using your method.
Think back:What information can you easily get from standard form?
ORCan you change it to an equivalent form?
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