Answer:
x = 1/4
Step-by-step explanation:
To solve, we need to find the constant of proportionality (k) which is defined by the equation:
yx = k

Therefore when y= 16,

Answer:
the answer is x = -6 and x =5
just took the test
You're starting at 400. Each time you're cutting in half.
So the common ratio is 1/2 which means the equation is

which is in the geometric sequence format. So the answer is choice D
It is called a constant.
Remember a "variable" means that the value of that term can change depending on the value of the "x" or "y". Since (in this case), -6 does not have a variable attached, it will not change, it will remain CONSTANT.