I really need help, please can you help me

Question

Input 1 2 3 4 n

Output -6 -4 -2 0

I need help finding the equation

An example for another question's answer is

-1 x n - 5

Answer 1

f(x) = y

f(1) = y= -6 x-y=7

f(2) =y=-4 x-y=6

f(3) =y=-2 x-y=5

f(4) =y= 0 x-y=4

as x increases by 1, the difference between x and y decreases by 1

as y increases by 2, x increases by 1

"rise over the run" is the slope = m = 2/1 = 2, the change in y divided by the change in x is the slope

use the point slope formula to get the equation of the line

use (4,0). it's simpler

y=2(x-4)

y = 2x -8