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March 31, 2015

March 31, 2015

Posted by **Elizabeth** on Monday, February 18, 2008 at 4:46pm.

I get the main idea, but i just don't know how to write it out.

Thanks!!

- Algebra 1 -
**Damon**, Monday, February 18, 2008 at 5:07pmP + R = 89

R + S = 80

P + S = 85

Now let's subtract equation 3 from equation 2

R - P = -5

now add that ot equation 1

P + R = 89

R - P = -5

------------

2 R = 84

so

R = 42

Now I will leave it to you to work your way back up and find P and S

- Algebra 1 -
**Elizabeth**, Monday, February 18, 2008 at 6:47pmin the first step, what happened to the S? I understand how you got -5, but I don't understand what happened to S. i understand everything else, just that.

would S = -5?

- Algebra 1 -

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