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If $m$ and $b$ are constants, which equation represents a linear function where $x$ is the input and $y$ is the output?$\newline$Choices:$\newline$(A)$y = \frac{m}{x} + b$$\newline$(B)$y = mx + b$$\newline$(C)$y = mx^2 + b$$\newline$Which statement about the function is true for any values of $m$ and $b$?$\newline$Choices:$\newline$(A)The graph has a constant rate of change.$\newline$(B)The graph has a positive $y$-intercept.$\newline$(C)The graph has a positive slope.$\newline$(D)The graph is not a straight line.