If a function is linear, what shape does its graph take?

A linear function is defined by a constant rate of change, which means that as the input (or x-value) changes, the output (or y-value) changes at a consistent pace. This characteristic creates a uniform slope, resulting in a graph that represents a straight line.

In algebraic terms, a linear function can typically be expressed in the form ( y = mx + b ), where ( m ) is the slope and ( b ) is the y-intercept. The presence of the term ( mx ) indicates that for every unit increase in ( x ), ( y ) increases by a constant amount, yielding a straight line when plotted on a coordinate plane.

The other shapes mentioned, such as circles, parabolas, and zigzags, represent different types of functions and characteristics. Circles are defined by quadratic relationships, parabolas exhibit a variable rate of change and can open upward or downward, while zigzag patterns could represent piecewise functions or oscillating behaviors. None of these maintain the consistent slope characteristic of linear functions, which is why the graph of a linear function is distinctly a straight line.