Posted by shelley on Sunday, December 20, 2009 at 6:18pm.
I cannot figure this out I keep getting the order pair(1.24,3.44), but it does not work when I check. Can you help me?
5x+5y=11
7x3y=19
The other oneI needed to solve is this Question: 4y+3y<35
I got 5>35...is that right?

Math  bobpursley, Sunday, December 20, 2009 at 6:25pm
the first one does check.
7y<35
y<5

Mathquick???  Sw, Sunday, December 20, 2009 at 7:03pm
Are you sure that the sigh does not change In the second problem? I thought that when you divide by neg then the signs switch?
My instructor told me that the first one was wrong, so I kept going over it and over it, and she insists that it is wrong, unless she wants me to use fractions, but an answer in a decimal form is still considered an integer right?

Math  Reiny, Sunday, December 20, 2009 at 7:20pm
I agree with bobpursley, your first equation solution is correct. It should not matter if you answer as a decimal or fraction of the decimal is exact, which it is.
As to your question about reversing the sign for inequations:
Yes, you do reverse the inequality sign if you multiply or divide by a negative, BUT...
you did not divide by a negative, you divided both sides by +7, so it stays the same.
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