Carlos solved the system of equations below. What mistake did he make in his work?
2x + y = 5
x - 2y = 10
y = 5 - 2x
x - 2 (5 - 2x) = 10
x + 10 + 4x = 10
5x + 10 = 10
5x = 0
x = 0
2 (0) + y = 5
y = 5
He should have substituted 5 + 2x
He did not distribute correctly
He combined like terms incorrectly, it should have been 4x instead of 5x
He made no mistake
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