Hey!
So you want to used PEMDAS and need to solve the numerator first.
so 3^2 is 9.
6+9*4 / 7. - 1
now multiply 9 and 4 and add 6
42/7 - 1
Now you want to divide first before you subtract again because of pemdas
Now you have 6 - 1 = y left
the answer is y = 5
Hope this helps!