4x - 6y = 10 5x + 7y = -2 If you were going to solve this system by elimination by adding the two equations together, what would be a correct first step? A) Multiply the first equation by 7 and the bottom by 6. B) Multiply the first equation by 5 and the bottom by 4. C) Multiply the first equation by -7 and the bottom by 6. D) Multiply the first equation by 7 and the bottom by -6.