What is a linear equation?

A linear equation is characterized by its ability to graph as a straight line on a coordinate plane. This type of equation typically takes the form (y = mx + b), where (m) represents the slope and (b) the y-intercept. The defining feature of a linear equation is that it does not include any exponents greater than one, nor does it involve products of variables, which ensures the graph remains a straight line.

The choice indicating that a linear equation graphs a curved line is incorrect because that would pertain to non-linear equations, such as quadratic or exponential equations. Similarly, the assertion that a linear equation has no solutions does not apply universally; many linear equations do, in fact, have solutions. Finally, stating that a linear equation involves variables only doesn't encapsulate the essential quality that defines linear equations, which specifically relates to their graphical representation as straight lines.