How do you solve # y=x+3# and #y=2x# using substitution?
3 Answers
Explanation:
substitute
a quick mental check in
Explanation:
Substitution in a system means that you write a variable in term of the other(s), and then replace every occurrence of that varable in the other equations.
It's easier done than said! Let's take a look at your system:
Both equations give us an explicit representation of
This is an equation involving
Once we find one variable, we deduce the other using it's explicit representation: we knew that
PS, note that this was a special case, since both equations were an explicit representation for
By guessing what is the value of
Explanation:
We have to find the value of
We have to guess the value of
Let's make the value of
That will become:
Simplify;
This can't be right because the
Let's go up by one number: 3
That is:
Which is:
The answer is 6.
Hope this helps!!