Help pleas I need it

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.