Final answer:
To evaluate 6b - c with b = -5 and c = 18, substitute the values in to get -30 - 18, which simplifies to -48.
Step-by-step explanation:
To evaluate the expression 6b - c when b = -5 and c = 18, we need to substitute the given values into the expression. So the solution becomes:
6b - c = 6(-5) - 18
Now, multiplying 6 by -5:
6(-5) = -30
Therefore, the expression simplifies to:
-30 - 18
Finally, subtracting 18 from -30 gives us:
-30 - 18 = -48
So, the value of the expression 6b - c when b = -5 and c = 18 is -48.