Question 263367: how do i use the the substitution method for 9m+n=24 m-3n=12
to find the ordered pairs. Found 2 solutions by angphy, JBarnum:Answer by angphy(3) (Show Source):
You can put this solution on YOUR website! 9m+n=24- 1st equation
m-3n=12- 2nd equation
First, you want to get m by itself in the 2nd equation
m-3n=12 add 3n to both side of the equation to isoslate m
+3n +3n
m=3n+12. then, you can substitute in m in the 1st equation
9(3n+12)+n=24 solve to find n
27n+108+n=24
28n+108=24
-108 -108
28n=-84 divide by 28 on both side of the equation to isoslate n
n=-3
Put the value of n into the 1st equation
9m+n=24
9m+(-3)=24 add 3 to get 9m by itself
+3 +3
9m=27 Divide by 9 to isoslate m
m=3
Answer:(3,-3)
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