Drizzle some oil in a large pot of boiling salted water.
Add the linguine and cook 7-10 minutes or until done.
Meanwhile, in a 12-inch pan, melt the butter and olive oil over medium-low heat, add the garlic. Sautee for 1 minute. Be careful, not to burn the garlic. Add the red pepper flakes.
Add the shrimp, 1 teaspoon of salt and pepper and sauté until the shrimp turn pink, about 2 minutes per side, stirring often.
Remove from the heat, add the parsley, lemon zest, lemon juice - stir gently to combine.
When pasta is ready, drain the linguine add to the pan of shrimp,
Toss together well, plate, and add garnish of lemon slices and parsley.