SOLUTION: { y=3x x+2y=-21. Sovle the system by by substitution. Enter your answer as an ordered pair, or type none or infinite.

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Question 1071877: { y=3x x+2y=-21. Sovle the system by by substitution. Enter your answer as an ordered pair, or type none or infinite.
Found 2 solutions by Boreal, MathTherapy:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
y=3x
x+2y=21
substitute
x+6x=21
7x=21
x=3
y=9
check
3+18=21
(3,9)

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

{ y=3x x+2y=-21. Sovle the system by by substitution. Enter your answer as an ordered pair, or type none or infinite.
Correct answer: highlight_green%28matrix%282%2C3%2C+x%2C+%22=%22%2C+-+3%2C+y%2C+%22=%22%2C+-+9%29%29