(2/3),=(1/2), 3,4
.
............................
The answer is -6. because 12,10,8,6,4,2,0,-2,-4,-6.
In the given question , we have a function given , which is

And we need to find the value of y when x=5.
So we substitute 5 for x and solve for y, that is

And on rounding to the nearest tenths, we will get

So when x=5, y=0.4