Which tables represent constant functions?

a. x y
2 -1
2 0
2 1

b. x y
2 -3
4 -7
6 -11

c. x y
2 3
4 3
6 3

d. x y
1 3
2 12
3 27

e. x y
1 -1
2 -1
3 -1

C and E repr. constant functions.

Step-by-step explanation:

C and E represent constant functions.  One can tell immediately by the fact that y remains the same even when x changes.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: