The sum of the digits of a two-figured number is 9. if the digits are interchanged, the number obtained is only 3/8 as large as the original number. find the number.!

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

Me. i can't figure out this question. give an explanation too. .

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me