Question

how to graph 3 and -1 on a coordinate plane

Answer 1

Start at the point of origin aka (0,0) then go right 3 as 3 is a positive number then go down 1 as it's a negative. You'll arrive at the point of (3,-1).

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Answer 2

Your coordinate point will be in the 4th Quadrant, because you are dealing with the x coordinate as a positive, and the y coordinate as a negative.

(+,+) = 1st Quadrant
(-,+) = 2nd Quadrant
(-,-) = 3rd Quadrant
(+,-) = 4rth Quadrant