Find all real zeros of the function y=2x-4

For this case we have the following linear function:
 
 What we must do is equal the function to zero or equivalently, substitute the value of y = 0 in the given function.
 We have then:
 
 From here, we clear the value of x.
 We have then:
 
 
 all real zeros of the function y = 2x-4 are:
 x = 2