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Which ordered pair is not a solution of y= -4x - 9 ?
A. (-9, 27)
B. (3, -21)
C. (-6, 15)
D. (5, -28)

Sagot :

Naǫidn
[tex]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[/tex]

[tex](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[/tex]

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