Which graph represents the solution set for the inequality 1/2x<18

Which of these is and example of a literal equation? a) 6+30=6^2 b)3x-4y c)12=9+3x d)ax-by=k

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !

20 ! brainliest ! add and simplify your answer.