Jarred sells dvds. his inventory shows that he has a total of 3,500 dvds. he has 2,342 more contemporary titles than classic titles. let x represent the number of contemporary titles and y represent the number of classic titles. the system of equations models the given information for both types of dvds.

x + y = 3,500

x – y = 2,342

solve the system of equations. how many contemporary titles does jarred have?

Statements reasons 1. ab ? cd; ad ? bc 1. given 2. ac ? ac 2. reflexive property 3. ? adc ? ? cba 3. ? 4. ? dac ? ? bca; ? acd ? ? cab 4. cpctc 5. ? dac and ? bca are alt. int. ? s; ? acd and ? cab are alt. int. ? s 5. definition of alternate interior angles 6. ab ? cd; ad ? bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?