This equation really just wants you to plug in the values it gives you. In this case, it gives you the value of x, which is 2, and it gives you the value of z, which is 13. So wherever we see an x in the above equations, we are gonna put a two there instead, so we do this:
y = 2+z
All I did was replace the x with a 2. Now we do the same thing for the z. We are going to replace the z with its value of 13. So our equation now looks like this:
So now that we have replaced the x and the z, we can simplify the problem to this:
All I did was add 2 and 13 together to get 15. By doing this, we have also found our answer! y=15. So in this problem, the value of is y=15.