Which functions have a positive rate of change and which have a negative rate of change?

Column A Column B

1. 2x - 3y = 9 A. positive

B. negative

2. y = - 4x + 5

3. x y

-1 - 5

1 1

3 7

4. x y

1 - 2

2 - 6

3 - 10

Ok I just did a test on this and my teacher taught me how to do it, For problem like number 3 with the table of numbers, You take the first to sets like - 1,-5 and 1,1 ... Then you do 1 - (-5) = your answer then 1 - (-1) = your answer than you get 6 and 2 ... you want to divided those numbers 6/2 = 3 and that is positive so #3 is positive. Same thing for #4 1,-2 and 2,-6 - 6 - (-2) = x 2 - 1 = x x/x I want you to solve #4 for yourself #2 is already done y = - 4x + 5 just take the - 4 and - 4 is negative so #2 is negative. Then #1 I have a hard time with those but I think it's positive