An auto mechanic charges $50 to diagnose a problem and $25 per hour to repair the problem. If x represents the total number of hours worked and y represents the total charges, which equation represents this situation?

The total charge includes a fixed $50 diagnosis fee plus $25 for each hour of repair. For x hours, the repair cost is 25x, so the total is y = 25x + 50. This matches choice A, y = 25x + 50.

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