Hello from MrBillDoesMath!
Answer:
(1,r) is point on the Cartesian plane
Discussion:
(1,r) is an ordered pair with a first component (the "x" component) and a second component (the "y" component). In this case (1,r) appears to be a point (punto) whose x coordinate is 1 and whose y coordinate is "r"
Thank you,
MrB
