Big Ideas Math Algebra 1, 2015
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Big Ideas Math Algebra 1, 2015 View details
Chapter Review
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Exercise 26 Page 167

Make a table of values for f, then write h in the form y=f(x)+k.

Graph:

functions_graph

Transformation: The graph of h is a vertical translation 1 unit up from the graph of f.

Practice makes perfect

We are asked to graph f(x)=3x+4 and h(x)=f(x)+1. Also, we need to find the transformations from the graph of f to the graph of h.

Graph of f(x)

To graph f(x), we will first make a table of values.

x 3x+4 f(x)
-2 3( -2)+4 -2
-4/3 3( -4/3)+4 0
-2/3 3( -2/3)+4 2

Now, we can plot these points and connect them with a straight line to have the graph of f(x).

graph of f

Graph of h(x)

Let's recall the definition of a vertical translation. When adding a number k to a function's output, the function translates the graph vertically. y=f(x)+ k A value of k less than 0 represents a shift down of the original function. Conversely, when k is "greater than" 0, the function is shifted up. Because h is written in the form y=f(x)+ k, we can state that h is a vertical translation of f. h(x)=f(x)+ 1 In this case, k is 1. Since 1>0, h(x) is a vertical translation 1 unit up from the graph of f.

translation graph