Thread: DS - equation
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Old July 31st, 2008, 10:05 AM
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e-d<-12...from statement 2

add e+d to both side
e-d<-12
e-d+e+d<-12+e+d
2e<-12+(e+d)
from statement 1
2e<-12-12
2e<-24
e<-12---devide both side by 2


since e<-12 e could be -13,-14,-15...
to satisfy statement 1(e+d=-12)
d>0
hence C
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