exam Maths Puzzle Numerical Ability

question 1: use matrix method to solve
2x+3y = 11
7x-2y = 1

question 2: use method of determinant to solve
7x-2y = 23
5x-3y =

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exam Other Question

find the number of sides of a regular polygon in which each exterior angles measures 168. The problem says to "solve" the following:

x/3 - 1/4 = 3x-8/12

Any assistance provided on this problem is greatly appreciated. Thank you in advance.