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# i need help with linear functions

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The table below represents a linear function f(x) and the equation represents a function g(x):

 x f(x) -1 -12 0 -6 1 0

g(x)

g(x) = 2x + 6

Part A: Write a sentence to compare the slope of the two functions and show the steps you used to determine the slope of f(x) and g(x).

Guest Oct 19, 2017

#1
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Let's pick two points off of the table:  (1, 0)  and  (0, -6)

slope of  f(x)  =  $$\frac{\text{change in f(x)}}{\text{change in x}}\,=\,\frac{-6 - 0}{0-1}\,=\,\frac{-6}{-1}\,=\,6$$

g(x)  =  2x + 6    Notice that this is in slope-intercept form, so we can already tell that its slope is  2 .

6 > 2 ,   so the slope of f(x) > the slope of g(x) . f(x) is "steeper" than g(x).

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The y-intercept is the value of the function when  x = 0 .

On the table, there is the point  (0, -6) .

So the y-intercept of f(x)  is  -6 .

To find the y-intercept of g(x), plug in  0  for  x  and solve for  g(x) .

g(0)  =  2(0) + 6

g(0)  =  6                So the y-intercept of g(x)  is  6 .

6 > -6 ,   so the y-intercept of g(x) > the y-intercept of f(x).  g(x) has a greater y-intercept.

hectictar  Oct 20, 2017
edited by hectictar  Oct 20, 2017
#1
+7179
+2

Let's pick two points off of the table:  (1, 0)  and  (0, -6)

slope of  f(x)  =  $$\frac{\text{change in f(x)}}{\text{change in x}}\,=\,\frac{-6 - 0}{0-1}\,=\,\frac{-6}{-1}\,=\,6$$

g(x)  =  2x + 6    Notice that this is in slope-intercept form, so we can already tell that its slope is  2 .

6 > 2 ,   so the slope of f(x) > the slope of g(x) . f(x) is "steeper" than g(x).

----------

The y-intercept is the value of the function when  x = 0 .

On the table, there is the point  (0, -6) .

So the y-intercept of f(x)  is  -6 .

To find the y-intercept of g(x), plug in  0  for  x  and solve for  g(x) .

g(0)  =  2(0) + 6

g(0)  =  6                So the y-intercept of g(x)  is  6 .

6 > -6 ,   so the y-intercept of g(x) > the y-intercept of f(x).  g(x) has a greater y-intercept.

hectictar  Oct 20, 2017
edited by hectictar  Oct 20, 2017