To convert the given polar equation to rectangular form, here are the steps.
1. Remember that sec θ = 1/cos θ. This means, the given polar equation can also be written as:

2. We can multiply cos θ to both sides of the function to remove the cos θ in the right side.

3. Since we know that x = r cos θ, we can say that x = -3. This is the rectangular form of the equation.
