## Elementary Algebra

$\dfrac{2y}{15x}$
Cancelling the common factor between the numerator and the denominator, the given expression, $\dfrac{4y}{30x} ,$ simplifies to \begin{array}{l}\require{cancel} \dfrac{\cancel{2}\cdot2y}{\cancel{2}\cdot15x} \\\\= \dfrac{2y}{15x} \end{array}