942 views
4 votes
PLZ HELP WORTH 25 PTS!!!!!

Consider the following piece-wise function.

How would the portion of the graph labeled "a" be defined?

(Answer choices are attached)

PLZ HELP WORTH 25 PTS!!!!! Consider the following piece-wise function. How would the-example-1
PLZ HELP WORTH 25 PTS!!!!! Consider the following piece-wise function. How would the-example-1
PLZ HELP WORTH 25 PTS!!!!! Consider the following piece-wise function. How would the-example-2

1 Answer

4 votes

Answer:


\displaystyle y=- (1)/(2)x-3

(first option)

Explanation:

Linear Functions

They can be defined by knowing two points on them or a point and the slope of the line. The portion "a" of the piecewise function must have these conditions, only by looking at the graph

* It must be decreasing, the slope must be negative

* It must be defined for x<-2, because for x>-2, the function is defined by another piece.

* It must pass through the point (-2,-2)

Options 2 and 4 are immediately discarded, since x>2

Testing it (-2,-2) belongs to


\displaystyle y=- (1)/(2)x-3


\displaystyle y=- (1)/(2)(-2)-3=1-3=-2

The point (-2,-2) belongs to this function, so it's the correct choice. Let's verify the last function


\displaystyle y=- (1)/(2)x-6


\displaystyle y=- (1)/(2)(-2)-6=-5

This is not the point we are testing, so the portion of the graph labeled "a" is


\boxed{\displaystyle y=- (1)/(2)x-3}

(First option)

User Artur Movsesyan
by
8.0k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories