Question

Choose the best definition for the following term: substitution.

A letter that holds the place for some unknown value in mathematics.
A process where you must look for terms that have identical variable parts and then combine their coefficients.
A process where if two things are equal, one can be put in the place of the other and nothing will change.
Terms that have identical variable parts.
PLEASE HELP WILL GIVE MEDAL

Answer 1

Here is an example of substitution:\[\Large\rm \color{orangered}{x=y}\]In this equation below,\[\Large\rm \color{orangered}{x}+2=2y\]Since x is equivalent to y, we can replace the x with y,\[\Large\rm \color{orangered}{y}+2=2y\]That would allow us to solve for y.

Answer 2

@WolfMaster

Answer 3

So when you have two things that are equivalent, you can put one in place for the other.
Does that sound like one of your options? :o

Answer 4

so a process where two things are equal?

Answer 5

@zepdrix

Answer 6

yes