SOLUTION: Help me solve 1) 3x-y=7,for y 2) 5y-10+y=7y+18-5y

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Question 640554: Help me solve
1) 3x-y=7,for y

2) 5y-10+y=7y+18-5y
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
# 1

3x-y=7

-y=7-3x

-y=-3x%2B7

y=%28-3x%2B7%29%2F%28-1%29

y=%28-3x%29%2F%28-1%29%2B%287%29%2F%28-1%29

y=3x-7

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# 2
5y-10%2By=7y%2B18-5y Start with the given equation.


6y-10=7y%2B18-5y Combine like terms on the left side.


6y-10=2y%2B18 Combine like terms on the right side.


6y=2y%2B18%2B10 Add 10 to both sides.


6y-2y=18%2B10 Subtract 2y from both sides.


4y=18%2B10 Combine like terms on the left side.


4y=28 Combine like terms on the right side.


y=%2828%29%2F%284%29 Divide both sides by 4 to isolate y.


y=7 Reduce.


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Answer:

So the solution is y=7