I need help quick I need to see these two problems worked out in both the SUBSTITUTION and the ELIMINATION

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The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?

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Latest exam Aptitude Question SOLUTION: I need help quick. I need to see these two problems worked out in both the SUBSTITUTION and the ELIMINATION methods. 2x-3y=-1, 3x-4y=5 then 2x+3y=5, 9y=15-6x HELP

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(#M40128775) EXAM Numerical Ability question Keep an EYE

I need help quick. I need to see these two problems worked out in both the SUBSTITUTION and the ELIMINATION methods.
2x-3y=-1, 3x-4y=5 then 2x+3y=5, 9y=15-6x HELP

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