Can you help me solve two more? I thought I would get it if you showed me the steps for two of them but it turns out I was wrong >_<. I tried the elimination one first. I did this question :

3r-5s= -9

6r+2s= 18

So I followed what you did.

-7s= 27

s= -27(divided by)7. But then I got the answer as: 23.14285714.

Can you help me do that question as well as the one where you have to substitute:

2d-3c= 5

5d+2c = 22

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Also I have two other questions I hope somebody might be able to help me solve.

1. The least of three consecutive integers is divided by 10, the next is divided by 16, the greatest is divided by 26 and the sum of the quotients is 10.

2. In a Math contest, the teams gain 15 points for each correct answer and lose 8 for each incorrect answer. One team had answered 50 questions and got a score of 336. How many questions did the team answer correctly?