SOLUTION: Solve the system by substitution. x + y = 12 y = 2x Need help someone

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Question 49316: Solve the system by substitution.
x + y = 12
y = 2x
Need help someone
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Solve by substitution:
1) x%2By+=+12
2) y+=+2x Substitute this into equation 1)
1a) x%2B%282x%29+=+12 Simplify and solve for x.
1b) 3x+=+12 Divide both sides by 3.
1c) x+=+4 Now substitute this into equation 2) and solve for y.
2a) y+=+2%284%29 Simplify.
2b) y+=+8
Solution is: (4, 8)