X – y = 2 and x + y = –3 what does x and y equal? 2x + 3y = 6 and x + 2y = 5 what does x and y equal?
3x – y = 2 and x +2y = 3 what does x and y equal?

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

70

step-by-step explanation:

16

step-by-step explanation: