Answer:
r = 1
Explanation:
You can plug the numbers for y and x into their spot in the equation. Then, isolate the (r) by dividing by the x number.
example:
plug in the numbers
5.8 = r · 5.8
divide by x
5.8 / 5.8 = r · 5.8 / 5.8
the 5.8 divided by itself will = 1
so, r = 1