Question

solve the following equation by substitution method. X-Y= 0.9, 11/2(X+Y)=1

Answer 1

11/2(x+y)=1
x + y = 2/ 11
x + 0.9 = 2/11 (y=0.9)
x = 2/11 - 0.9
x = 0.18 - 0.9
x = -0.72

Answer 2

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