Straight line equations have two variables in the form of x and y
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An equation with two variables . . . seriously!An equation with one variable can be can be solved, but when there are two variables, you need two equations. This is called a system of two equations in two variables.Three equations in three variables, etc.
A system of equations.
A system of equations is a set of two or more equations with the same variables, graphed in the same coordinate plane
simultaneous equations
william roman