Quotes about linear equations of two variables: Life is like solving a linear equation of two variables, with many ways and many results. According to the query of relevant public information, there are famous quotes about linear equations of two variables. Life is like solving a linear equation of two variables, with many ways and many results. A linear equation of two variables contains two unknowns, and an integral equation in which the degree of the terms containing the unknowns is 1 is called a linear equation of two variables.