This equation will be a linear combination of these two variables and a constant can be present. That is all of the unknown variables in a linear equation are raised to the power of one. Definition of a Linear Function.
A and b are called constants.
Linear equations ones that graph as straight lines are simpler than non-linear equations and the simplest linear system is one with two equations and two variables. Linear equations ones that graph as straight lines are simpler than non-linear equations and the simplest linear system is one with two equations and two variables. For instance consider the linear equation y 3 x 5. When x increases y increases twice as fast so we need 2x.