Answer:
Option 2 is correct that is It is a line joining the points whose x and y-coordinates add up to 5.
Explanation:
We have been given the expression:

So, we can see that the sum of x-coordinate and y-coordinate is 5.
it is a straight line here, x-intercept is (5,0) and y-intercept is (0,5)
You can see the graph of the line in the attachment.
Therefore, option 2 is correct that is It is a line joining the points whose x and y-coordinates add up to 5.