im just trying to find the rule:

a 5 6 7 8 9
b 3.8, 4.6, 5.4, ?, ?

4 answers

please help ASAP
. . a . . b . . . difference
. . 5 . . 3.8 . . 1.2
. . 6 . . 4.6 . . 1.4
. . 7 . . 5.4 . . 1.6
. . 8 . .
slope for the first two = (4.6-3.8)/(6-5) = .8 or 4/5
slope for the second pair = (5.4 - 4.6)/(7-6) = .8 or 4.5

so b = .8a + k
using (5,3.8)
3.8 = .8(5) + k
k = -.2

b = .8a - .2

plug in a = 7,8,9..... to get the b's
slope for the first two = (4.6-3.8)/(6-5) = .8 or 4/5
slope for the second pair = (5.4 - 4.6)/(7-6) = .8 or 4.5

so b = .8a + k
using (5,3.8)
3.8 = .8(5) + k
k = -.2

b = .8a - .2

plug in a = 7,8,9..... to get the b's

I can copy people too, Reiny