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May 28, 2015

Homework Help: Algebra

Posted by Kat on Sunday, January 25, 2009 at 8:55pm.

Hi, I'm looking at my book and I can't see how they've gotten this answer:

The last bit:

-11/20y=-3

Their answer is y=60/11

How did they get that?

The full problem, if it helps:
1/4y+2=4/5y-1
1/4y-4/5y=-1-2
-11/20y=-3
y=60/11

Okay, since typing it out - I see that they've multiplied the 20 times the -3. But why? I'm worried I won't know when do to it this way.

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