What are the domain and range of f(x) = 4x – 8? domain: {x | x is a real number}; range: {y | y > –8} domain: {x | x is a real number}; range: {y | y > 8} domain: {x | x > 4}; range: {y | y > –8} domain: {x | x > –4}; range: {y | y > 8}