The function is given by the formula y = -3 + 6. Find the value of the function at -3.

We are given a linear function by the formula y = -3x + 6.

It is necessary to calculate the value of the function at the point x = -3.

We need to substitute the value x = -3 into the equation of the function y = -3x + 6 and perform the calculation.

So, we substitute the value into the equation and perform the calculation:

y (-3) = -3 * (-3) + 6 = 9 + 6 = 15.

When x = -3, the function takes on a value of 15.

Now we can write down the answer.

Answer: for x = -3, the function takes on the value 15, or it can be written as y (-3) = 15.