Aline has a slope of -1/2 and a y-intercept of 3.
which equations represent the line?
choose all answers that are correct.
a. 2y = 6 + x
b. x + 2y = 6
c. y = -1/2x + 3
d. (y - 2) = -1/2( x - 2 )

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