exam Maths Puzzle Numerical Ability

5x+7y=b
mx+y=22

Find the vaule of m and b in the following systems so that the soultion to the system is (-3,4).

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exam Other Question

please help to simplify

m^x/3*n^3x

DIVIDED BY

m^2x*n^3x/4 the sum of the digits of a two digit number is 12. if the digits are reversed the number is 15 more than twice the orignal number what is the original number? how did you get it?