1/3+ blank =3/4 pl help

Find the value of x for which the lines are parallel.

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?