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March 26, 2015

March 26, 2015

Posted by **shelley** on Sunday, December 20, 2009 at 6:18pm.

5x+5y=-11

7x-3y=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 6:25pmthe first one does check.

7y<-35

y<-5

- Mathquick??? -
**Sw**, Sunday, December 20, 2009 at 7:03pmAre 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 7:20pmI 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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