Which of the following rules represents the set of ordered pairs? {(5, -1), (3, 7), (1, 15), (0, 19)}

ƒ( x ) = -2 x - 5
ƒ( x ) = 8 x - 23
ƒ( x ) = -4 x + 19

3rd one

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set each factor equal to 0

4x-3 = 0

2x-1 = 0

solve for x.

4x-3=0

4x=3

x= 3/4

solve for x. 

2x-1= 0

2x= 1

x= 1/2

eventually after a few more steps, your answer should be 1/2 is less than or equal to x and 3/4 is greater than or equal to x