SOLUTION: How do you solve a problem using substitution if you have no kown variables.
Question is:
x-2y=3
4x-8y=12
Algebra.Com
Question 710295: How do you solve a problem using substitution if you have no kown variables.
Question is:
x-2y=3
4x-8y=12
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Solve one of the equations for one of the variables in terms of the other. For example 
is equivalent to 
.
Then substitute the expression in 
for 
in the second equation.
\ -\ 8y\ =\ 12)
Solve the resulting single variable equation. You will either get a single answer which you then substitute back in to either of the original equations, or...
You will get a triviality, such as 
. This means that the solution set of the system has infinite elements, or...
You will get an absurdity, such as 
. This means that the solution set of the system is the empty set.
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
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