SOLUTION: method of usbstitution 1:a=5-2b 5a+2b=1 2: 2m+n=0 m+2n=3 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

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Question 624841: method of usbstitution
1:a=5-2b
5a+2b=1
2: 2m+n=0
m+2n=3
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
Found 2 solutions by Alan3354, ewatrrr:
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
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
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 

Hi,

using Substitution to find the solution for the System:

couple of Exs:

1:a=  **     

 5a+2b=1,   5() + 2b = 1 

            25-10b+2b=1   

             -8b = -24  

               b = 3 and a = -1    ||**

 5: a-2b=9  'or'  a =  **  

 2a+3b=4,  2() + 3b = 4  

                   4b +18 +3b = 4  

                        7b = -14  

                         b = 2   and a = 13   |||**

   

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