chapter 6: linear function group member: angela, vincent, krystal, antony
TRANSCRIPT
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Chapter 6: Linear Function
Group Member: Angela, Vincent, Krystal, Antony
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What is slope? What is the formula to calculate slope? How to determine slope through two points on a line?
How to verify a parallel line or a perpendicular line to a given one?
How to calculate a parallel or a perpendicular line to a given one?
How to use slope to identify polygon?Three different forms of writing an equation of a linear
function.Using an Equation of a Linear Function to Solve a
Problem.
Agenda
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SlopeSlope is the steepness of a roof is measured by calculating
its slope.The formula of the slope is: Slope= Rise/Run
Hint: Rise: The vertical distance from the bottom of edge of the roof to
the top Run: The corresponding horizontal distance.
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ExampleCalculate the slope of
the linear function.
From the graph, we can see that the rise=2, the run=1. Then we can calculate the slope: Slope=Rise/Run =2/1 =1
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Parallel LinesIf two lines have the same slope, the two lines parallel to
each other.Example: y=2x+1 and y=2x+3
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Perpendicular LinesIf two line perpendicular to each other, that means that
the two slopes are negatively reciprocal to each other.
Example: y=2x+1 and y=-1/2 x+1
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In this graph, the linear function of this line is y=2x+1. Can you write a linear function that is parallel to the line?
How to determine a parallel line to a given one?
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Solution
The parallel line and the given line should have the same slope. The slope of the given line is : 2So, the slope of the line should be: 2So, the linear function of the line should be y=2x+2/3/4, etc.
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In this graph, the linear function of this line is y=2x+1. Can you write a linear function that is perpendicular to the line?
How to determine a perpendicular line to a given one?
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Solution
The perpendicular line’s slope the negative reciprocal of the slope of the given line.
The slope of the given line is : 2So, the slope of the line should be: -1/2So, the linear function of the line should be y=-1/2x + 1/2/3/4, etc.
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ABCD is a parallelogram. Is it a rectangle? Justify the answer.
How to use slope to identify polygon?
a
b
c
d
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Solution
ABCD is a parallelogram. If one of the angle is 90, we can prove that it is a rectangular.
Step 1: we can determine the slope of line AB and line ADStep 2: we can identify whether the slope of AB is the negative reciprocal
of slope AD.Step 3:we can easily identify whether it is a rectangle or not.
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Slope-Intercept Formy-intercept form: y=2x+1Advantage: We can easily determine the intersection with y-axis
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Slope-Point FormSlope-point form: y-y1=m(x1-x2)
Example: y-2=1/3*(x+4)
Advantage: We can easily know that (-4,2) is on this line.
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General FormGeneral form can be represented as: ax+by+c=0
Example: 2x+3y-12=0
Hint: You should always check the order-----x y number
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