Solve by the substitution method: 7m+n=24 m-2n=12

Question

anonymous · Answer

m-2n=12
m=2n+12
Plug that m value into other equation

anonymous · Answer

I don't understand.

anonymous · Answer

You have two sets of equations
1)7m+n=24
2)m-2n=12

anonymous · Answer

Your goal is to isolate a variable one equation, so
2) m-2n=12
     m=2n+12
This tells  us that m is same as 2n+12 which means whenever we see 'm', we can instead write 2n+12.

Plugging that into first equation
7m+n=24
We know what m is 
7(2n+12)+n=24
14n+84=24
you can solve for n from here

anonymous · Answer

So M then equals 24? So on the other equation, I would say 24-2n=12?

anonymous · Answer

24-2n=12 so n= 6?

anonymous · Answer

where are you getting 24-2n=12 from?

anonymous · Answer

Well I thought that is m=24 I would plug 24 in to M for the second equation.

anonymous · Answer

how is m=24?