Answer: Option 1
Explanation:
We must first note that this function is written in slope intercept form
f(x) = mx + b, where m is the slope, and b is the y-intercept.
In this case f(x) can be rewritten as
f(x) = -1(x) + 6.
Therefore the slope is -1 and the y-intercept is 6. We can eliminate the
options where the slope is positive (increasing).
In addition, we can eliminate the option where the y-intercept is not 6.
Thus the first option best matches the function.