Rewrite each explicit formula in the form of a function. Part A
an= 19 - 7(n-1)
f(n) =
Part B
an= 1.5 +4.2 (n - 1)
f (n) =

Alarger number is double the sum of a smaller number. the larger number is 2 less than 3 times the smaller number. if y represents the larger number and x represents the smaller number, which equations model the situation