SOLUTION: I am working on substitution an elimination.I can figure out how to do the problems when they are in the right form but I don't know how to solve it when the problem is set up diff

Question 814252: I am working on substitution an elimination.I can figure out how to do the problems when they are in the right form but I don't know how to solve it when the problem is set up different. example... 2x-y=7 -7y=2x-31 On my paper the two equations are lined up over each other but I can't get it like that on here.
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
2x - y = 7
-7y = 2x - 31
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2x - y = 7
-2x - 7y = -31
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add
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-8y = -24
---
y = 3
2x - y = 7
2x - 3 = 7
2x = 10
x = 5
---
Answer:
x = 5
y = 3
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