Which one of the following equations represents a circle with its center of origin? A) x^2 + y^2 = 5
B) x^2 + y = 25
C) x + y = 5
D) x/2 + y/2 = 25

Step-by-step explanation:

The equation of the circle:

The center is (h, k)

Wen the center is the origin we have, h = 0, k = 0:

The only equation in same format is the first one

y - y1 = m(x- x1)

y - (-5) = 2/3(x -0)

y + 5 = 2/3x

y = 2/3x - 5

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.