What is the first step in solving this system of equations?
2x - 5y = 7
3x + 7y = - 3
A. Multiply the first equation by 7 and the second by 2.
B. Multiply the first equation by 3 and the second equation by - 2.
C. Add the equations together.
D. Multiply the first equation by 2 and the second equation by 3.
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