x + y = 12
x - y = 4
Add the two equations together to eliminate the y.
2x = 16 x = 8 so y = 4
Check these values in the original equations.
A cord is cut into two pieces of different lengths. The sum of the two lengths is 12 centimeters, and the difference between the two lengths is 4 centimeters. Find the lengths of the two pieces of cord.
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