Find each sum or difference. See Example 1. 4 - 9

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Identify the operation to be performed: the problem asks to find the sum or difference of the numbers 4 and -9.

Recall that subtracting a negative number is equivalent to adding its positive counterpart. So, rewrite the expression \(4 - 9\) as \(4 + (-9)\).

Understand that adding a negative number is the same as moving left on the number line, which means the result will be less than 4.

Perform the addition of \(4 + (-9)\) by combining the numbers: subtract 9 from 4 because the second number is negative.

Express the final result as \(4 - 9 = 4 + (-9)\), which simplifies to a single number less than zero.

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