Posted by esa on Thursday, January 19, 2012 at 11:57am.
a + 3d + a + 7d = 10
2a + 10d = 10
a + 5d = 5
a+5d + a+11d = 22
2a + 16d = 22
a + 8d = 11
subtract them
3d = 6
d = 2
back into the first
a + 5d = 5
a + 10 = 5
a = -5
first 3 terms are -5, -3, -1
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