Question

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
7x-3y=19

The other oneI needed to solve is this Question: 4y+3y<-35
I got -5>-35...is that right?

Answer 1

the first one does check.

7y<-35
y<-5

Answer 2

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?

Answer 3

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.