Evaluate the expression –3x – 6y + z, where x = –2, y = 1, z = 7.

To evaluate the expression –3x – 6y + z, where x = –2, y = 1, z = 7, you need to substitute the values of x, y, and z into the expression.

Step 1: Substitute x = -2, y = 1, z = 7 into the expression. This gives us: -3(-2) - 6(1) + 7

Step 2: Simplify the expression. Multiplying -3 and -2 gives us 6. Multiplying 6 and 1 gives us 6. So, the expression becomes: 6 - 6 + 7

Step 3: Continue to simplify the expression. Subtracting 6 from 6 gives us 0. Adding 0 and 7 gives us 7.

So, the value of the expression –3x – 6y + z, where x = –2, y = 1, z = 7 is 7.