Welcome to our lesson on linear equations. A linear equation is an algebraic equation where each term has an exponent of 1, and there are no products of variables. When graphed, a linear equation always forms a straight line. There are several standard forms of linear equations. For one variable, we write ax plus b equals c. For two variables, we have the standard form Ax plus By equals C, and the slope-intercept form y equals mx plus b, where m represents the slope and b is the y-intercept. The graph shows an example of a linear equation y equals zero point five x plus 2, which forms a straight line.