Question

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

Answer 1

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

Answer 2

I don't understand.

Answer 3

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

Answer 4

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

Answer 5

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

Answer 6

24-2n=12 so n= 6?

Answer 7

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

Answer 8

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

Answer 9

how is m=24?