About: http://webisa.webdatacommons.org/387868207

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Economist wrote:when x<0, |x| = -x...so the first eq becomesY = -x + (-x) = -2x ?????When x is negative, you do not replace x with -x; if x is negative, then -x is a positive number.
http://www.w3.org/ns/prov#wasQuotedFrom	gmatclub.com