Answer:
the vertex is the lowest point
Step-by-step explanation:
2x+9+3x+x combine like terms 2x+3x+x=7x rewrite 7x+9
hope this helps have a nice nite
Here is my answer. I hope it is helpful.
To solve this problem you must apply the proccedure shown below:
1. By definition, the rate of change of a linear function is the slope of the line and it is constant. Based on this, you must find the slope of the given function.
2. You have the equation of the line has the following form:

Where
is the slope and
is the y-intercept.
3. Then, you have that the slope of the function
is:

Therefore, the answer is: 
Answer:
i am not to positive but i think its C
Step-by-step explanation: