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Is-absolute-value-of-x-linear-equation-




Question Number 215919 by abdelsalam last updated on 21/Jan/25
   Is absolute value of x linear equation ?
$$\:\:\:{Is}\:{absolute}\:{value}\:{of}\:{x}\:{linear}\:{equation}\:?\: \\ $$$$ \\ $$
Commented by A5T last updated on 21/Jan/25
General linear equation: y=mx+c  where m is the constant slope  For ∣x∣, the slope is not constant, so it is not   linear - but it could  be “divided” into linear parts.  ∣x∣= { ((x when x≥0)),((−x when x<0)) :}  So, the slope is not constant, could be 1 or −1.
$$\mathrm{General}\:\mathrm{linear}\:\mathrm{equation}:\:\mathrm{y}=\mathrm{mx}+\mathrm{c} \\ $$$$\mathrm{where}\:\mathrm{m}\:\mathrm{is}\:\mathrm{the}\:\mathrm{constant}\:\mathrm{slope} \\ $$$$\mathrm{For}\:\mid\mathrm{x}\mid,\:\mathrm{the}\:\mathrm{slope}\:\mathrm{is}\:\mathrm{not}\:\mathrm{constant},\:\mathrm{so}\:\mathrm{it}\:\mathrm{is}\:\mathrm{not}\: \\ $$$$\mathrm{linear}\:-\:\mathrm{but}\:\mathrm{it}\:\mathrm{could}\:\:\mathrm{be}\:“\mathrm{divided}''\:\mathrm{into}\:\mathrm{linear}\:\mathrm{parts}. \\ $$$$\mid\mathrm{x}\mid=\begin{cases}{\mathrm{x}\:\mathrm{when}\:\mathrm{x}\geqslant\mathrm{0}}\\{−\mathrm{x}\:\mathrm{when}\:\mathrm{x}<\mathrm{0}}\end{cases} \\ $$$$\mathrm{So},\:\mathrm{the}\:\mathrm{slope}\:\mathrm{is}\:\mathrm{not}\:\mathrm{constant},\:\mathrm{could}\:\mathrm{be}\:\mathrm{1}\:\mathrm{or}\:−\mathrm{1}. \\ $$

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