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Need solving this second acceleration problem.

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11