Simplify each of the following if `x = 5` and `y = 2`.
`-12 + 8x - 9y `

Answer

To simplify the expression \(-12 + 8x - 9y\) when \(x = 5\) and \(y = 2\), follow these steps:

### Step 1: Substitute the values of \(x\) and \(y\)
We start with the expression:
\[ -12 + 8x - 9y \]
Now, we substitute \(x = 5\) and \(y = 2\):
\[ -12 + 8(5) - 9(2) \]

### Step 2: Calculate the multiplication
Next, we perform the multiplication:
\[ -12 + 40 - 18 \]
Here, \(8 \times 5 = 40\) and \(9 \times 2 = 18\).

### Step 3: Combine the terms
Now, we combine the terms:
\[ -12 + 40 - 18 \]
First, we can add \(-12\) and \(40\):
\[ 28 - 18 \]

### Step 4: Final calculation
Finally, we subtract \(18\) from \(28\):
\[ 28 - 18 = 10 \]

### Final Answer
Thus, the simplified value of the expression when \(x = 5\) and \(y = 2\) is:
\[ \boxed{10} \]