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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
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2A+B =150
Now subtract the unused equation.
2A+B=150
- -3A+B=0
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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
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