Question

for the inverse variation equation $xy = k$, what is the constant of variation, $k$, when $x = 7$ and $y = 3$?
$\bigcirc\\ \frac{3}{7}$
$\bigcirc\\ \frac{7}{3}$
$\bigcirc\\ 10$
$\bigcirc\\ 21$

Explanation:

Step1: Substitute given values

Substitute $x=7$ and $y=3$ into $xy=k$.
$k = 7 \times 3$

Step2: Calculate the product

Compute the multiplication to find $k$.
$k = 21$

Answer:

21