SOLUTION: Which of the following is a method for solving systems of two variables? Substitution Addition Both of the above None of the above I think it's both but not too

SOLUTION: Which of the following is a method for solving systems of two variables? Substitution Addition Both of the above None of the above I think it's both but not too

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Question 148900: Which of the following is a method for solving systems of two variables?
Substitution
Addition
Both of the above
None of the above

I think it's both but not too sure
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
You are correct.
.
Substitution method described here:
http://www.purplemath.com/modules/systlin4.htm
.
Addition method described here:
http://www.purplemath.com/modules/systlin5.htm
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