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2021-06-22 22:50:32.000000

We can form four equations A+B = 8 C-D = 6 A+C = 13 B+D = 8 Let’s solve these four equations and find the variables A, B, C & D! if we add the four equations A+B+C-D+A+C+B+D = 8 + 6 + 13 + 8 2(A+ + 2C = 35 2C = 35 - 2*8 (by replacing A+ 2C = 35 - 16 = 19 C = 9.5 from 2nd Equation C - D = 6 D = C - 6 D = 9.5 - 6 D = 3.5 from 3rd equation A+C = 13 A = 13 - C A = 13 - 9.5 A = 3.5 from 4th equation B + D = 8 B = 8 - D B = 8 - 3.5 B = 4.5