How to do solve system of equations with three variables?
1 Answer
If there are
Lets say
You will follow these three steps:
-
By using
#C# , write#z# in terms of#x# and#y# -
Replace
#z# with its equivalent in#B# . Then write#y# in terms of#x# -
In
#A# , replace#y# with its equivalent and replace#z# with its equivalent (if its equivalent involves#y# , replace#y# ) then solve#A# for#x# .
Now you should know the value of
Finally, you should have written
Example
Lets find
We are writing
Now we are plugging
So we can write
Now we are plugging
Now we know the value of
By using
By using
So