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Subtracting a negative number is mathematically equivalent to adding its positive counterpart. In the slope calculation, the expression $0 - (-3)$ represents the difference between the y-coordinates.

Conditions: The arithmetic operation involves subtracting a negative number.; The context is evaluating the numerator of the slope formula $y_2 - y_1$.; The values are $y_2 = 0$ and $y_1 = -3$.

Subtracting a negative number is mathematically equivalent to adding its positive counterpart. In the slope calculation, the expression $0 - (-3)$ represents the difference between the y-coordinates.

Conditions: The arithmetic operation involves subtracting a negative number.; The context is evaluating the numerator of the slope formula $y_2 - y_1$.; The values are $y_2 = 0$ and $y_1 = -3$.