posted by Peter .
Solve using linear combinations.
x - 5y = 6
3x + 4y = 18
What are linear combinations?
Since this is not my area of expertise, I searched Google under the key words "linear combinations" to get these possible sources:
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/