SOLUTION: what is 2x+y=21 and x-y=6

Question 1013865: what is 2x+y=21 and x-y=6

Found 2 solutions by ikleyn, fractalier:
Answer by ikleyn(52778) (Show Source): You can put this solution on YOUR website!
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what is 2x+y=21 and x-y=6
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It is the system of two equations in two unknowns.

Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
From these two equations, we add them to get
2x+y=21
x-y=6
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3x = 27
x = 9
y = 3
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