I need help knowing what the difference is :
Select the best possible first step to solving the following system by first eliminating the y variable.
5x-3y=1
7x-4y=2
My options are to:
Multiply the first equation by 3 and multiply the second equation by 4.
Multiply the first equation by -3 and multiply the second equation by -4.
Multiply the first equation by -7 and multiply the second equation by 5.
None of the above.
My instinct is to multiply the equations by either 3 and 4 or -3 and -4, but I don't know what the difference is in multiplying by a negative or a positive.

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@ChmE Please help!

are you sure you wrote the options correctly?

and the question?

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