Question

ues substition method to fin solution sets:

I need step by step help
2a+4b=-24
a=20-2b

Answer 1

In 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.

Answer 2

The 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

Answer 3

i have a+b=-12
a+2b=20
is this correct?

Answer 4

No.
The first equation is
2a + 4b = -24
Where you see a, write (20 - 2b)
You should have no a's left there.

Answer 5

i get -4 is this correct?

Answer 6

as my finale answer

Answer 7

for b

Answer 8

You 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.

Answer 9

The first equation is
2a + 4b = -24
Where you see a, write (20 - 2b)

Answer 10

i did

Answer 11

Where is it then?
It should look like this:
2a + 4b = -24
2(20 - 2b) + 4b = -24