Ineed with a system of equations question

Is fgh ~ jkl? if so, identify the similarity postulate or theorem that applies.

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x