math
posted by mikey123 on .
solve by the substitution method
3x + 6y = 27
2x + y = 12
what is the solution of the system..(type an ordered pair, or N if there is no solution)

3x+6y=27
y=2x+12
Then 3x+6(2x+12)=27
3x+12x+72=27
15x=45
x=9 
i get that part but it tells me im wrong that they want it something like this..(3,4)i don't get that..

Geepers, if x is 3, calculate y from either equation and put it in that form (3,?)
Note that La Tarial made a typo, x=3, not 9 
Actually, it is wrong, La Trial made another error.
3x+12x+72=27
15x=45
x=15
so y = 2(15)+12