Will mark !

a tire shop counted 80 invoices at the end of the month. they charge $325 for a set of new tires and $50 for a set of used tires. the total dollar amount of the invoices was $6,750. let x represent the number of sets of new tires and y represent the number of sets of used tires. which system of equations represents the situation?

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem