To fill in the table we have to calculate the values of the function, for the x-values given.
y = -6x +3
x = -5
y = -6*-5 +3
y = 30 + 3
y = 33
x = -1
y = -6*-1 +3
y = 6 + 3
y = 9
x = 0
y = -6*0 +3
y = 3
x = 1
y = -6*1 +3
y = -6 + 3
y = -3
And the table is:
x | y
-5 | 33
-1 | 9
0 | 3
1 | -3