Select the best possible first step to solving the following system by first eliminating the y variable.
5x - 3y = 1
7x - 4y = 2
Choose one answer. a. Multiply the first equation by 3 and multiply the first equation by 4.
b. Multiply the first equation by -3 and multiply the second equation by -4.
c. Multiply the first equation by -7 and multiply the second equation by 5.
d. None of the above.

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None of the options given work.

None of the above..We can't make them equal from the given options.

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