SOLUTION: solving this is hard for me i just don't get it but here it goes -2x+7<-1 please note the < has a - underneath it did'nt know how to write it but neg -1 is part of expression

Algebra ->  Graphs -> SOLUTION: solving this is hard for me i just don't get it but here it goes -2x+7<-1 please note the < has a - underneath it did'nt know how to write it but neg -1 is part of expression      Log On


   



Question 134710: solving this is hard for me i just don't get it but here it goes -2x+7<-1 please note the < has a - underneath it did'nt know how to write it but neg -1 is part of expression
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
The dash under the < means "equal" so the equations say "
(-2x+7) less than or equal to (-1). I'll use <= becuase I can type it
%28-2x+%2B+7%29+%3C=+%28-1%29+
-2x+%3C=+-1+-+7
-2x+%3C=+-8+
now here is the tricky part. If you multiply or divide both sides by a negative number, the less than becomes a greater than and vice-vera
2x+%3E=+8+
x+%3E=+4+
Now check your answer.
set x = 4 and solve -8%2B7%3C=+-1 -1+%3C=+-1+ which it true
now set x to a number > 4, let's use 5
-10+%2B+7+%3C=+-1+
-3+%3C=+-1 which is true