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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? [tex] \left \{ {{x - y = 16} \atop {0.5x + 0.2y = 25}} \right. [/tex]

Sagot :

iGreen
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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