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You want to eliminate y by addition in the systems 6x - 8y = 5, 9x - 6y = 1?

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If you multiply both sides of the top equation by 3, by which number would you multiply both sides of the bottom equation?

A -2

B 2

C 4

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  1. c. 4

    Actually it should be -4, so that the -8y X 3= -24y is opposite to

    -6y X -4=+24y,but you can always do the multiply by -1 as a second

    step

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