Posted by HELP me please on Monday, January 24, 2011 at 8:38am.
I suggest you study the two answers given before and proceed with solving the remainder. This way, you will have no problems to face your exams.
One of the answers is:
http://www.jiskha.com/display.cgi?id=1295847952
Have you tried substitution?
In the second problem,
x = -6 - (3/2)y
-30 -(15/2)y = 4y -30
y = 0
5x = -30
x = -6
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