Answer: The required value of the given expression is 30.
Step-by-step explanation: We are given that
[tex]4x-3y=10~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]
We are to find the value of the following expression :
[tex]12x-9y.[/tex]
We have
[tex]12x-9y\\\\=3(4x-3y)\\\\=3\times10~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~[\textup{Using equation (i)}]\\\\=30.[/tex]
Thus, the required value of the given expression is 30.
