Question

Please help I’m not sure how to do this

Answer 1

When you substitute P and Q you should get wrong equation, then it will have no solution.
A) -68x-68=-68x+34
          -68 = 34 False, no solutions

B)-68x+68=-68x+34
  68=34 False, no solutions 
C)-68x-34=-68x+34
-34=34 False, no solutions
D) -68x+34=-68x+34
  34=34 True , so this equation will have infinite number of solution.

A,B,C have no solutions, D has infinite number of solutions.