It asks to find the domain and range f(x) = 3x + 5
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Domain and range are both real numbers (or could be complex) giving $\displaystyle f:\mathbb{R}\to\mathbb{R}$ You should recognise this as the equation of a straight line.
so.... the domain is {x|x∈R} and the range is {y|y ≤ 3, y∈R} ? 'cause I'm also having trouble with this.
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