x=abs(y+z)
x=+(y+z)=y+z
x=-(y+z)=-y-z
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a linear equation
Because linear equations are based on algebra equal to each other whereas literal equations are based on solving for one variable.
A linear equation represents a line. A linear inequality represents part of the space on one side (or the other) of the line defined by the corresponding equation.
Simultaneous equation
The statement "A system of linear equations is a set of two or more equations with the same variables and the graph of each equation is a line" is true.