HELP ME PLEASE ILL SELL MY SOUL FREE OF CHARGE triangle ABC has vertices A(3, 1), B(8, y), and C(4, 6).  The area of the triangle is 12 square units.​

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

inch

step-by-step explanation:

yard and mile are too big.