Respuesta :

21x(9)=9x21
21y= 9x21
Y=9x21/21
Y=9x1
Y=9

Answer: The correct answer is 9.

Step-by-step explanation:

Multiplication property of equality is defined as the property in which the a number multiplied on one side of the equation must be multiplied to the other side of the equation with the same sign.

[tex]a\times c=b\times c[/tex]

c is multiplied on both the sides of the reaction.

In the given question:

[tex]21\times x=9\times 21[/tex]

Thus, the value of 'x' will be 9 by associative property.