Do the ordered pairs below represent a relation, a function, both a relation and a function, or neither a relation or function? (-1,-1),(3,-9),(6,-15),(9,-21)

the answer is d

the answer is in the first quadrant, which make the y-int positive.

since the dots are going down, therefore the correlation is negative

i hope it is right.

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or