SOLUTION: Solve the following system of equations for the unknown variables. a + b = 7 a + c = 12 b + c = 15

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Question 143828: Solve the following system of equations for the unknown variables.
a + b = 7
a + c = 12
b + c = 15

Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
Given:
a+%2B+b+=+7
a+%2B+c+=+12+
b+%2B+c+=+15+
-----
a+%2B+b+=+7
a+=+7+-b+
------
a+%2B+c+=+12+
%287-b%29+%2B+c+=12
c+=+12+-+7+%2B+b+
c+=+5+%2B+b+
------
b+%2B+c+=+15+
b+%2B+%285+%2B+b%29+=+15+
+2b+=+10+
+b+=+5+
-------
c+=+5+%2B+b+
c+=+5+%2B+5+
c+=+10
--------
a+=+7+-b+
a+=+7+-+5
a+=+2+
Check your answers. Use this same approach for other problem you posted