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Most of
the time they aren't set up that nicely. You'll
usually have to do a little dinking before something
will drop out.
Look at this one:
If we just add
straight down, nothing's going to drop out and we'll just get a
mess.
But, check out the
y
guys:
If we could make this a
+4y,
the y's
would drop out...
So, let's do it!
Remember that we can multiply an equation by a number... So,
let's multiply the second equation by a
-2:
Remember to hit each guy! |
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Now, stick the
x guy
into either of the original equations. I'm going to go for the
first one:
| The answer is
(-1,
|
 |
) |
Check it - and don't
let that fraction freak you... These things happen!
YOUR TURN:
Solve by elimination:
* Hint: ditch the
x!
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prohibited. |
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