Which set of ordered pairs represents a function

A (2,5),(1,6),(0,5),(1,10)
B (0,0),(1,1),(2,0),(3,3)
C (2,1),(3,1),(5,1),(5,4)
D (5,4),(4,5),(1,2),(1,4)

B is a function.

Step-by-step explanation:

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)

c-   36

taxicab circle radius 9 has 4(9) = 36 points