Final answer:
To evaluate x - y, substitute the given values and perform the subtraction.
Step-by-step explanation:
To evaluate x - y, we substitute the given values of x and y into the expression and perform the subtraction operation. So, when x = -5 and y = -6.8, the expression becomes:
-5 - (-6.8) = -5 + 6.8 = 1.8
Therefore, the value of x - y, when x = -5 and y = -6.8, is 1.8.
Learn more about Evaluating expressions with given values