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.
this problem is setting you up for elimination, starting with y. This means that when you subtract the second equation from the first equation, the y variable should disappear. Each of the answer choices are supplying a way to change the equations so that when you subtract them from each other the y's cancel.