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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §11.4 Matrices and Linear Equations, #23 · Linear Algebra · Linear systems

With the same percentages moving, suppose … billion are inside and …

With the same percentages moving, suppose $d_{1} = 0.58$ billion are inside and $d_{2} = 4.92$ billion are outside at the end. Set up and solve two equations for the original populations $x$ and $y$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §11.4 Matrices and Linear Equations, #23

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