From a + b = 15, which expression solves for a in terms of b?

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Multiple Choice

From a + b = 15, which expression solves for a in terms of b?

Explanation:
Isolating the variable a is the goal. From a + b = 15, subtract b from both sides to move it away from a: a = 15 − b. This directly expresses a in terms of b, showing how a depends on the value of b. The alternative b = 15 − a would describe b in terms of a, which is not the asked-for form, even though it’s algebraically equivalent. So the form that provides a explicitly as a function of b is a = 15 − b.

Isolating the variable a is the goal. From a + b = 15, subtract b from both sides to move it away from a: a = 15 − b. This directly expresses a in terms of b, showing how a depends on the value of b. The alternative b = 15 − a would describe b in terms of a, which is not the asked-for form, even though it’s algebraically equivalent. So the form that provides a explicitly as a function of b is a = 15 − b.

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