Question

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

Answer 1

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

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

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