Final answer:
Given the equation 8-7x-8y=8, which simplifies to -7x-8y=0, the value of 6(-7x-8y) equals 6 times 0, which is 0.
Step-by-step explanation:
To find the value of 6(-7x-8y) given the equation 8-7x-8y=8, we can first rearrange the equation to isolate the term containing x and y. The given equation can be simplified as follows:
8 - 7x - 8y = 8
-7x - 8y = 8 - 8
-7x - 8y = 0
Now, multiplying this expression by 6 gives us:
6(-7x-8y) = 6(0)
6(-7x-8y) = 0
Therefore, the value of 6(-7x-8y) is 0.