Which relation is a function? a. {(1, −1), (−2, 2), (−1,  2), (1, −2)} b. {(1, 4), (2, 3), (3,  2), (4, 1)} c. {(1, 2), (2, 3), (3,  2), (2, 1)} d. {(4, 2), (3, 3), (2,  4), (3, 2)}

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)