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Rumore947 Rumore947
  • 20-07-2015
  • Mathematics
Answered

Use the substitution method to solve the system of equations. Choose the correct ordered pair. x + y = 11 -x = -y - 9

A(9, 2)
B(10, 1)
C(8, 3)
D(11, 0)

Verified Answer :

naǫ
naǫ naǫ
  • 20-07-2015

\(x+y=11 \\ -x=-y-9 \\ \\ \hbox{substitute the second equation by -1} \\ \\ x+y=11 \\ x=y+9 \\ \\ \hbox{substitute y+9 for x in the first equation} \\ \\ y+9+y=11 \\ 2y=11-9 \\ 2y=2 \\ y=\frac{2}{2} \\ y=1 \\ \\ x=y+9 \\ x=1+9 \\ x=10 \\ \\ (x,y)=(10,1)\)

The answer is B.

Answer Link
blackbolt1
blackbolt1 blackbolt1
  • 15-10-2020

Answer:

B

Step-by-step explanation:

Apex

Answer Link

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