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2010-01-25T23:01:42+01:00
A)
a1+4r=5
a1+7r=-1
a1=5-4r
5-4r+7r=-1
a1=5-4r
11r=-6/(-1/11)
a1=5-4r
r=6/11
a1=3i 9/11

b)
a1+4r=2
a1+99r=97
a1=2-4r
2-4r+99r=97
a1=2-4r
95r=95/95
r=1
a1=-2

c)
a1+82r=38
a1+37r=83
a1=38-82r
38-82r+37r=83
a1=38-82r
-45r=45/(-45)
r--1
a1=120
8 2 8