What is the solution set of {x | x < -5} ∩ {x | x > 5}? the numbers between -5 and 5
all real numbers
all numbers less than -5 and greater than 5
the empty set

What will the graph look like for a system of equations that has no solution? a. the lines will be perpendicular. b. the lines will cross at one point. c. both equations will form the same line. d. the lines will be parallel.