What is the value of x in the equation x  – y = 30, when y = 15? its not 45 tho

-15 would be your answer a negative plus a negative the signs together would turn negative 15 to positive

It’s -15 because when you subtract 15 from 30 it turns out as 15 but then when you try doing +15-15 it comes out as 0, instead of adding positive 15, do negative because a negative times a negative is positive.
The answer would be -15-15=30

Hope this helps!!