A bag with total 25 balls contain x blue and y red balls. If the number of blue balls is four times the number of red, then write the two equations.
 

First write the equations for each statement in terms of x and y. Then, check them with the given options.

It is given that the total number of balls is 25.

It can be written as,

$\Rightarrow x+y=25$

It is also given that the number of blue balls is four time the number of red balls.

It can be written as,
$x=4y$

Thus, the two equations are $x+y=25, x=4y$