SOLUTION: I'm 46 and am trying to refresh my algebra.... How would I solve this by using substitution or the addition-or- subtraction method? 2m=n-3 3m=2n-9 Thanks

Question 459938: I'm 46 and am trying to refresh my algebra....
How would I solve this by using substitution or the addition-or- subtraction method?
2m=n-3
3m=2n-9
Thanks

Found 2 solutions by Gogonati, richwmiller:
Answer by Gogonati(855) (Show Source): You can put this solution on YOUR website!
Multiply the first equation by -2 and get:
, add two equations to eliminate n.
or . Now plug in the first equation m=3 to find n=?
solving this equation we get
Answer: The solution of the system is the ordered pair (3, 9).
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
m=3 n=9
2m=n-3
3m=2n-9
substitution
n=2m+3
3m=2(2m+3)-9
3m=4m+6-9
3m=4m-3
0=m-3
3=m
2*3=n-3
6=n-3
9=n

check
6=9-3
6=6
9=18-9
9=9
ok

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