One linear expression is subtractive from a second linear expression and the difference is x -5 what is the difference when the second line here expression is subtracted from the first

For this case, the first thing we must do is identify the linear expressions.
 first linear expression = y1 = x
 second linear expression = y2 = 5
 We have then that the difference of the second with respect to the first is:
 y2-y1 = 5-x
 
 The difference when the second line is here is subtracted from the first is:
 5-x