Give the domain and range of each relation. Tell whether the relation defines a function a. {(13,12), (8, -3), (15,14), (5,17)}

b. {(3,21), (5, -11), (15,20), (3,4)}

c. {(9, -11), (5, -8), (21,1), (7, -4)}

d. {(19, -7), (10, -3), (1,7), (19,17)}

e. {(7,12), (11, 5), (14,12), (6, -1)}

the answer is c)8

step-by-step explanaction:

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)