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31 December, 16:56

Rosana used linear combination to solve the system of equations shown. She did so by multiplying the second equation by a certain number to eliminate the y-terms. What number did Rosana multiply the second equation by?

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  1. 31 December, 17:48
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    She multiplied it by 5, because that would make the equation:

    2.5 + y = 125

    So when we add - y and y cancel out
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