The value of x has been given as 11. Therefore we shall insert the value into the equation given as follows;
[tex]y-x=13[/tex]Substitute for x equals 11
[tex]y-11=13[/tex]Next step we add 11 to both sides of the equation
[tex]y-11+11=13+11[/tex]This now becomes;
[tex]y=24[/tex]The value of y is 24