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I get f(x) = -2x+5. Is that correct? 

Julius  Feb 18, 2018
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We have the points  (2,1)  and (3, -1)  on the graph

 

The slope is    [ - 1 - 1 ] / [ 3 - 2 ]  =  -2/1  =  - 2

 

Using either point to write the equation of a line, we have

 

f(x)  = -2 (x - 2) + 1

 

f(x)  =  -2x + 4 + 1

 

f(x)  = -2x  + 5    .....correct Julius  !!!!

 

 

cool cool cool

CPhill  Feb 18, 2018

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