Question

Which ordered pair is not a solution of y= -4x - 9 ?

A. (-9, 27)
B. (3, -21)
C. (-6, 15)
D. (5, -28)

Answer 1

`y=-4x-9 \\ \\ (x,y)=(-9,27) \\ 27=-4 * (-9)-9 \\ 27=36-9 \\ 27=27 \\ true \\ \\ (x,y)=(3,-21) \\ -21=-4 * 3-9 \\ -21=-12-9 \\ -21=-21 \\ true`


`(x,y)=(-6,15) \\ 15=-4 * (-6)-9 \\ 15=24-9 \\ 15=15 \\ true \\ \\ (x,y)=(5,-28) \\ -28=-4 * 5-9 \\ -28=-20-9 \\ -28=-29 \\ not \ true`

D. (5,-28) is not a solution of y=-4x-9.