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A linear equation is an equation of a straight line, which means that the degree of a linear equation must be ${\displaystyle 0}$ or ${\displaystyle 1}$ for each of its variables. In this case, the degree of variable ${\displaystyle y}$ is ${\displaystyle 1}$, the degree of variable ${\displaystyle x}$ is ${\displaystyle 1}$, the degree of variable ${\displaystyle d}$ is ${\displaystyle 1}$ and the degree of variable ${\displaystyle t}$ is ${\displaystyle 1}$. the degrees of the variables in the equation violate the linear equation definition, which means that the equation is not a linear equation.