Answer
$y=\dfrac{z^2}{t}$
Work Step by Step
Using the properties of equality, in terms of $
y
$, the given expression, $
\dfrac{y}{z}\div\dfrac{z}{t}=1
$, is equivalent to
\begin{array}{l}
\dfrac{y}{z}\cdot\dfrac{t}{z}=1
\\\\
\dfrac{yt}{z^2}=1
\\\\
\dfrac{z^2}{t}\cdot\dfrac{yt}{z^2}=1\cdot\dfrac{z^2}{t}
\\\\
y=\dfrac{z^2}{t}
.\end{array}
