The table sows a a proportional relation and the equation for the relation is
y = -3x
How to find the equation
The equation for a relation that is proportional, is equation of the form
y = kx
Where k is the constant of proportionality
We solve for k by substituting the values from the table
For x = 1
-3 = k * 1
k = -3
Checking for other values
For x = 2
y = -3 * 2 = -6
For x = 3
y = -3 * 3 = -9
Hence we can say that the equation of the table is y = -3x