Yes, you JOIN them by drawing a straight line from one to the other. All points that you plot should fit on the same straight line, for an equation like that. The real line is infinite (never ends) because the domain is all real numbers, but you can only show the the part that...
I should have written the standard form as dy/dx + P(x)y = Q(x) I got the sign wrong on the P. In your case, Q = -P = (1/x) + 1 The form of the solution which I wrote should be correct.
Posting homework assignments under a variety of names, as you have done, while showing no work or thought of your own, will not increase your chances of being helped here.
For Further Reading