i just need help please

label Mathematics
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https://static.k12.com/eli/bb/180/-1/0/1_123839_17057/-1/275a82428505fb4f7e86fffcb922d93cb58718a8/media/627a27d708b9c0bcb2f474c62e8252d978f0393c/148009.PDF number 5 and 6 

May 8th, 2015

5) 5x-7=3x+9

2x=16

x=8

6)

x+y=6

3x-y=10


4x=16      x=4

y=6-4=2

May 8th, 2015

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