9 + (4 x y)
because it is 9 + 4 times any number (y,x,z)
The line y = -1 is a horizontal line passing through the point (0, -1).
Draw it.
Find the point (0, -1) and draw a line through it.
It is a line parallel to the x-axis.
If there just so happens to be that much candy, you probability (Both candies are green) would be 0.2×0.2= 0.04.
One way is brute force or experiment
20*10=200
20*100=2000
20*50=1000, that is the first 4 digit number
now add 5
1005
the answer is 1005