Respuesta :

tqiu

Answer:

[tex]xy=72[/tex]

Step-by-step explanation:

If x is inversely porportionaly to y, then for some constant k,

[tex]x = \frac{k}{y}\\xy=k[/tex]

Since y is 4 when x = 18, k is equal to 4*18=72, so the equation is:

[tex]xy=72[/tex]