Question

Which functions have a positive rate of change and which have a negative rate of change?
Column A
1.
2x − 5y = −15
2.
y = −4x + 9
3.
x y
2 –10
4 –16
6 –22

4.
x y
–3 15
–2 11
–1 7

I think 1 is positive and the rest negative