What does the equation x2 + y2 = 16 represent as a region in the set of real numbers3?

Let us say that x and y are points that are located in the Cartesian coordinate. The sum of the squares of x and y gives the square of the radius of the circle. Therefore the equation x^2 + y^2 = 16 given that x and y are real numbers represent a Circle.

A circle has a general formula of x^2 + y^2 = r^2

Yes, they are equivalent

Step-by-step explanation:

Case 1,

Distance = 250 miles

Time = 4 hours

Ratio = speed = distance/time

= 250 miles/4 hour

= 62.5 mph

Case 2,

Distance = 500 miles

Time = 8 hours

Ratio = speed = distance/time

= 500 miles/8 hour

= 62.5 mph

In both cases, the ratios 250 miles in 4 hours and 500 miles in 8 hours are equivalent.