Final answer:
The value of 8x-y when x = 3 and y = 4 is 20.
Step-by-step explanation:
To evaluate 8x-y for x = 3 and y = 4, we substitute x = 3 and y = 4 into the expression.
8x - y = 8(3) - 4 = 24 - 4 = 20
Therefore, the value of 8x-y when x = 3 and y = 4 is 20.
Learn more about Evaluating expressions