If x = yz/x + 1/y; and xy is not equal to 0, which of the following expressions is equal to z?
The answer given is:
x(xy - 1) / y2
derived by doing the following calculations:
step 1: x - 1/y = yz/x
step 2: x2 - x/y2 = z
step 3: x2y/y2 - x/y2 = z
result: x(xy -1) / y2
I now don't understand what happens at step 3. Why is also the nominator multiplied by y?
The answer given is:
x(xy - 1) / y2
derived by doing the following calculations:
step 1: x - 1/y = yz/x
step 2: x2 - x/y2 = z
step 3: x2y/y2 - x/y2 = z
result: x(xy -1) / y2
I now don't understand what happens at step 3. Why is also the nominator multiplied by y?
