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Let (f:\mathbb{R}\to\mathbb{R}), where (f(x)=ax+b). What is the necessary and sufficient condition for (f) to be onto?

Answer and explanation

Correct answer: (a\ne0)

Step 1: If (a\ne0), then for any (y\in\mathbb{R}), (x=\frac{y-b}{a}) is real. Step 2: Hence every (y) has a preimage. Step 3: A linear function on (\mathbb{R}) is onto when its slope is non-zero.

Related tags

Linear FunctionOnto ConditionReal FunctionReflexive RelationRelations And FunctionsMathematicsClass 12 Mcq

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