Three unknowns

Solve the system of linear equations with three unknowns:

A + B + C = 14

B - A - C = 4

2A - B + C = 0

Correct answer:

A =  4
B =  9
C =  1

Step-by-step explanation:

A + B + C = 14
B - A - C = 4
2•A - B + C = 0

A+B+C = 14
A-B+C = -4
2A-B+C = 0

A = 4
B = 9
C = 1

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