If y varies directly with x and y=8 when x=10 find y if x=20

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

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Determine which postulate or theorem can be used to prove that lmn =nmo