X=y+1 4x-y=19 substitution method

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.

What are the soultion(s) to the quadratic equation 40- x^2=0

Define multiplicative inverse. give an example of a number and its multiplicative inverse.