not always.
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The idea is to work with the same variables, but it is possible that some of the variables are missing in some of the equations.
if you can, you could always search a online calculator and use that.
Straight line equations have two variables in the form of x and y
A system of equations is a set of two or more equations with the same variables, graphed in the same coordinate plane
You need as many equations as you have variables.