In order to solve the following system of equations by addition, which of the following could you do before adding the equations so that one variable will be eliminated when you add them?

4x-2y=7
3x-3y=15

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

The verbal translation for the difference of m and 7 increased by 15

Which expression gives you the distance between the points (5,1)and(9,-6)