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1.2 Linear Functions: A function whose graph is a straight line that is not vertical. Linear functions take the form f(x) = mx + b X Intercept is where the function crosses the x axis. The point is in the form (a, 0) Y Intercept is where the function crosses the y axis. The point is in the form (0, b) Slope is the rate of change or the steepness of a linear function. Slope is found by taking the change in y over change in x. Horizontal lines have zero slope. Their equation is in the form f(x) = 0x + b or f(x) = b Vertical lines have undefined slope. Their equation is in the form x = a 1 a. x int = ( , ) y int = ( , ) b. x int = ( , ) y int = ( , ) a. x int = ( , ) y int = ( , ) b. x int = ( , ) y int = ( , ) 2 3 4