Select the best possible first step to solving the system by first eliminating the x variable.
4x + 9y = 21
3x - 8y = 1
A. Multiply the first equation by 3, and multiply the second equation by 4.
B. Multiply the first equation by - 3, and multiply the second equation by - 4.
C. Multiply the first equation by 8, and multiply the second equation by 9.
D. None of the above
(The answer isn't A, since I took the test and got it wrong)
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