Question 1126548
f(x) = a give you a horizontal line at y = a.


x = a gives you a vertical line at x = a.


the intersection of the horizontal line at y = a and the vertical line at x = 0 is the point (a,a).


this might be easier to see on a graph.


let a = 5


then the intersection of f(x) = 5 and x = 5 would be the point (5,5) as shown on the following graph.


when you graph f(x) = 5, you make f(x) = y and the equation becomes y = 5.


here's the graph.


<img src = "http://theo.x10hosting.com/2018/101802.jpg" alt="$$$" >