Question

A method of solving a system of equations in which one variable is replaced by an expression using the other variable as a representation for that variable.

Answer 1

what's your question?

Answer 2

I think you are talking about the substitution method

Answer 3

its a term

Answer 4

yeah lol no one ever understands it

Answer 5

m+n =5
m-n=3
then m=3+n
put in first (3+n) +n =5 and solve