Since y is directly proportional to x, we can say that y = kx, where k is the constant of proportionality.

First, we need to find the value of k. We can do this by substitifying the given values of x and y into the equation.

So, 128 = k * 1024.

Solving for k, we get k = 128 / 1024 = 0.125.

Now that we have the value of k, we can find the value of y when x = 64.

Substituting these values into the equation, we get y = 0.125 * 64 = 8.

So, the value of y when x = 64 is 8.

Therefore, the answer is B. 8.

Question

Since y is directly proportional to x, we can say that y = kx, where k is the constant of proportionality.

First, we need to find the value of k. We can do this by substitifying the given values of x and y into the equation.

So, 128 = k * 1024.

Solving for k, we get k = 128 / 1024 = 0.125.

Now that we have the value of k, we can find the value of y when x = 64.

Substituting these values into the equation, we get y = 0.125 * 64 = 8.

So, the value of y when x = 64 is 8.

Therefore, the answer is B. 8.

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