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Math Help

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|CCC|

EZ way to do multiple eqations

example:

given equations:
B=3A
C=A+30
180=A+B+C

Reorder equations so the variables match up.
A +B+C=180
-3A+B =0
A -C=-30

Add equations together so you can get rid of variables you might have to multiply an equation by a number to do this.

A+B+C=180
+ A -C=-30
-------------
2A+B =150

Now subtract the unused equation.

2A+B=150
- -3A+B=0
-------------
5A=150
A=30

Now all you need to do is substitute 30 in for A and you can find the answer to the other equation then substite A and C in another equation and walla.
A=30
B=90
C=60