Sabrina is using an online calculator to calculate the outputs f(n) for different inputs n. The ordered pairs below show Sabrina's inputs and the corresponding outputs displayed by the calculator: (1, 6), (2, 11), (3, 16), (4, 21) Which of the following functions best represents the rule that the calculator uses to display the outputs? f(n) = 5n − 1 f(n) = 5n + 1 f(n) = 4n + 3 f(n) = 4n − 3
test each
(1,6)
input is 1 and ouput is 6
f(1)=5(1)-1=6? false
f(1)=5(1)+1=6? true
f(1)=4(1)+3=6? false
f(1)=4(1)-3=6? false
answer is f(n)=5n+1