math
posted by micheal .
Solve by substitution method
9x+6y=219x+y=35
What is the solution of the method?

Those are two separate equations. You should have typed:
9x + 6y = 21
9x + y = 35
You can either add them, or SUBSTITUTE y35 for 9y in the first equation. Either way, you get
7y = 56
y = 8
9x + 48 = 21
x = 3
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