Which of the following relations shows a function? {(-5, 6), (4, -3), (2, -1), (4, 2)} {(3, -1), (3, -5), (3, 4), (3, 6)} {(-2, 3), (0, 3), (-2, -1), (-1, 2)} {(-5, 6), (-4, -3), (2, -1), (4, 2)}

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

mathpapa

step-by-step explanation: