# SOLUTION: how to use elimination method and substitution methods

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 Question 624855: how to use elimination method and substitution methodsAnswer by Alan3354(30983)   (Show Source): You can put this solution on YOUR website!how to use elimination method and substitution methods ================ Here's substitution: method of usbstitution 1:a=5-2b 5a+2b=1 Sub for a in the 2nd eqn 5(5-2b) + 2b = 1 25-10b + 2b = 1 -8b = -24 b = 3 ----- a = 5-2b a = -1 -------- 2: 2m+n=0 m+2n=3 Solve either eqn for either m or n: m+2n=3 --> m = 3-2n Then it's the same as #1 ======================== 3 to 7 are the same as #2 ----- 3: x+y=4 2x-y=5 4: y-2x=1 3x-4y=1 5: a-2b=9 2a+3b=4 6: x+2y=7 3x-2y=3 7: 2a+b=9 3a-2b=11