Elimination was used to solve a system of equations. One of the intermediate steps led to the equation 9x=27 . Which of the following systems could have led to this equation?

Question

Elimination was used to solve a system of equations. One of the intermediate steps led to the equation 9x=27 . Which of the following systems could have led to this equation?
4x+3y=24
−5x−3y=3

7x−2y=15
x+y=6

9x+2y=21
−9x−2y=21

10x−y=15
x+y=−12

PsyDAG · Answer

7x−2y=15 x+y=6 Multiply second equation by two and then add the equations.