Posted by **Mary jo** on Tuesday, April 7, 2009 at 8:40pm.

Solve by the elimination method.

5r-3s=2

3r 5s =42

r=-40

is this right.

4x+5y=7

5x-4y=5

Decide whteher the pair of line is parallel, perpindular, or n

I said is was parallel. Tell me if this right.

- Math -
**Reiny**, Tuesday, April 7, 2009 at 11:09pm
in your first question, you found only the one variable, you still have to find s

Besides that, you have a typo in the second equation.

in your second problem,

the slope of the first equation is -4/5

the slope of the second one is 5/4

notice they are negative reciprocals of each other.

What did you learn about that situation?

- Math -
**Latoya Harris**, Thursday, February 23, 2012 at 11:54am
-3(7r-5)=-48

can u help me solve this problem

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