Posted by Anonymous on Thursday, October 1, 2009 at 12:26pm.
"1/4(5x-1/2)-5/3<1/3 I got {x|x<51/30} "
51/30 needs to be simplified, otherwise correct.
"31-(2x+2)< or equal to 4(x+1)+x I got {x|x>equal to 3.6} "
3.6 is almost right, I get 3 4/7.
Since the answer can be expressed in a fraction, there is no reason to use decimal approximation.
"Use elimination method: 4x+5y=-12 and 7x-5y=-76 I got x=-8 and y=4 "
correct!
"0.3x-0.2y=4 and 0.4x+0.5y=1 I got the solution of (220/23,-130/23) "
correct!
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