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If (f:\mathbb{R}\to\mathbb{R}), (f(x)=2x-7), is (f) onto?

Answer and explanation

Correct answer: Yes, because for every real (y), (x=\frac{y+7}{2}) is real

Step 1: To check onto, write (y=2x-7). Step 2: We get (x=\frac{y+7}{2}), which is real for every real (y). Thus every codomain element is obtained. Step 3: A linear function with non-zero slope is onto from (\mathbb{R}) to (\mathbb{R}).

Related tags

Relations-FunctionsLinear-FunctionOnto-FunctionOnto FunctionRelations And FunctionsMathematicsClass 12 Mcq

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