Day 26 Graphing linear functions

Introduction A part from the symbolic and tabular representations of linear functions, it is also important to understand the graphical representations of the function so that we can visualize their properties. These properties include the slope, the intercepts and a straight linear path without any bend along its length.

Vocabulary: Slope It refers to the steepness of a line Equation of a line It is a symbolic representation showing a collection of numbers that describe a straight line Graph It is the visual representation of a function This can be done in the notebooks or on vocabulary cards. Whatever system you use 

To graph a linear function, we require either of the following. At least two points Given the coordinates of two points, a line can be drawn through them so that we come up with a graph of a linear function. A point and an intercept An intercept will help one get the second point. Thus, we will end up having two points whose graph can be drawn using the procedure above.

 

 

  -4 -3 -2 -1 1 2 3 4 5 x -1 -2 1 2 3 4 y

 

Upon drawing the graph, we get -4 -3 -2 -1 1 2 3 4 5 x -1 -2 1 2 3 4 y

Homework 1. Identify three points on the line below y 5 4 3 2 1 -4 -3 -2 -1 1 2 3 4 5 x -1 -2 1 2 3 4 y 5

Answers to the homework 1. (-4,5),(-1,3), (2,1), (5,-1)

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