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krissywatts
 2 years ago
ues substition method to fin solution sets:
I need step by step help
2a+4b=24
a=202b
krissywatts
 2 years ago
ues substition method to fin solution sets: I need step by step help 2a+4b=24 a=202b

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mathstudent55
 2 years ago
Best ResponseYou've already chosen the best response.0In the substitution method, you first need to solve one equation for one variable. In this case, that step is already done because the second equation shows what a is equal to. In other words, the second equation is already soved for a.

mathstudent55
 2 years ago
Best ResponseYou've already chosen the best response.0The second step is to substitute the variable a in the first equation with what a is equal to in the second equation. Since a = 20  2b, everywhere you see a in the firtst equation, wrtite 20  2b

krissywatts
 2 years ago
Best ResponseYou've already chosen the best response.0i have a+b=12 a+2b=20 is this correct?

mathstudent55
 2 years ago
Best ResponseYou've already chosen the best response.0No. The first equation is 2a + 4b = 24 Where you see a, write (20  2b) You should have no a's left there.

krissywatts
 2 years ago
Best ResponseYou've already chosen the best response.0i get 4 is this correct?

krissywatts
 2 years ago
Best ResponseYou've already chosen the best response.0as my finale answer

mathstudent55
 2 years ago
Best ResponseYou've already chosen the best response.0You ask for step by step help. I give you step by step help, but you skip a bunch of steps. You still haven't shown what you got after the substitution.

mathstudent55
 2 years ago
Best ResponseYou've already chosen the best response.0The first equation is 2a + 4b = 24 Where you see a, write (20  2b)

mathstudent55
 2 years ago
Best ResponseYou've already chosen the best response.0Where is it then? It should look like this: 2a + 4b = 24 2(20  2b) + 4b = 24
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