A class has a total of 50 students with x girls and y boys. The number of girls is twice the number of boys. Express these statements in the form of a linear equation.

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 students in the class is 50.

So, it can be written as,

$x + y = 50$

Also, the number of girls is twice the number of boys.

So, it can be written as,
 $x = 2y$

Therefore, option A is the correct answer.