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January 28, 2015

January 28, 2015

Posted by **unknown** on Sunday, January 20, 2013 at 9:04am.

the 11th is y find the 1st 2 terms

- math -
**Reiny**, Sunday, January 20, 2013 at 9:51ama+5d = x

a+10d = y

subtract them

5d = y-x

d = (y-x)/5

and

a + 5(y-x)/5 = x

a + y - x = x

a = 2x - y

first two terms are:

t1 = 2x-y

t2 = 2x-y + (y-x)/5 = (10x - 5y + y-x)/5

= (9x - 6y)/5

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