AF - Slope Intercept Form Day 1

AF - Slope Intercept Form

by Matthew Taylor

​Some things to know about Slope-intercept Form

Multiple Choice

What is the slope of this equation? 
y = 3x - 4 

• 3
• -4
• 3x
• 4

Multiple Choice

What is the y-intercept of this equation? 
y = 5x + 8 

• (0, 5)
• (5, 0) 
• (0, 8) 
• (8, 0) 

​Finding slope from a graph.

​Finding y-intercept from a graph

​Step 1: Follow the graphed line till it crosses the y-axis (the up and down axis)

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​Step 2: Identify the y-value that it passed through the axis at.

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​Step 3: Label this number as b.

Multiple Choice

What is the slope of this line?

• 1/3

• -1/3

• 3

• -3

• 1/4

Multiple Choice

What is the y-intercept of the graph shown?

• 2

• -2

• 6

• -6

Multiple Choice

Write the equation of the line.

• y = -1/3x - 2
• y = 1/3x - 2
• y = 3x - 2
• y = -3x - 2

Poll

How do we feel about finding equations from graphs?

• I feel Great!

• I feel a'ight!

• I do not feel a'ight!

• Please Help!

​Finding slope from a table

​Finding y-intercept from a table

​Step 1: Find the slope

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​Step 2: Pick a point (any point on the table.

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​Step 3: The slope is your m, the point is your x and y. Plug in all three numbers to y=mx+b

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​Step 4: Solve for b.

Multiple Choice

Find the slope for the linear function shown in the table.

• $$\frac{4}{3}$$  

• $$\frac{3}{4}$$  

• $$-\frac{4}{3}$$  

• $$-\frac{3}{4}$$  

Multiple Choice

What is the y-intercept of the table shown? 

• 10

• -10

• 20

• -20

Multiple Choice

What is the equation of the table shown? 

• $$f\left(x\right)=-\frac{4}{3}x+20$$  

• $$f\left(x\right)=-\frac{3}{4}x+20$$  

• $$f\left(x\right)=\frac{4}{3}x-20$$  

• $$f\left(x\right)=\frac{4}{3}x+20$$  

Poll

How do we feel about finding equations from tables?

• I feel Great!

• I feel a'ight!

• I do not feel a'ight!

• Please Help!