Question

the equation of a linear relation is: y=-3x+8 which ordered pairs are not relation: A (3, -1) B (7, -13) C ( 8, -16) D (9, -20)

Answer 1

You just need to put coordinate of x and y in equation:

1)
$-1=-3*3+8$
$-1=-1$
2)
$-13=-3*7+8$
$-13=-13$
3)
$-16=-3*8+8$
$-16=-16$
4)
$-20=-3*9+8$
$-20 neq -19$

The last pair isn't the relation of equation.