Your family goes to a restaurant for dinner. There are 6 people in your family. Some order the chicken dinner for $14.80, and some order steak for $17. If the total bill was $91, which system could you use to find out how many chicken dinners and how many steaks dinners were ordered?

5 order chicken 1 orders steak

x = number who order chicken

y = number who order steak

x+y=6

14.8x + 17y =91

14.8x + 17*(6-x) = 91

-2.2x +102 = 91

-2.2x = -11

x = 5

y = 6-x = 1

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

the answer is 2/54

step-by-step explanation: