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f(x) = mx + b
Restate the question: What are the functions that can represent a straight line?
The equation y=mx + b represents all straight lines except for a vertical line, which has undefined slope.
In function form, this is f(x) = mx + b. m represents the slope, and b the y-intercept.
x = a represents a vertical line, which is not a function.
The 'general form' of the straight line equation is Ax +By + C = 0. As long as B is not zero, this is a function.
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