Problem

Solve the system by the addition method. \[ \left\{\begin{array}{l} x^{2}-4 y^{2}=-32 \\ 2 x^{2}+y^{2}=17 \end{array}\right. \] The solution set is (Simplify your answer. Type an ordered pair. Use a comma to separate answers as needed.)

Solution

Step 1 :\(2*(x^{2}-4y^{2}) = 2*(-32)\)

Step 2 :\(2x^{2}-8y^{2}=-64\)

Step 3 :\(2x^{2}-8y^{2} - (2x^{2}+y^{2}) = -64 - 17\)

Step 4 :\(-9y^{2} = -81\)

Step 5 :\(y^{2} = 9\)

Step 6 :\(y = 3\) or \(y = -3\)

Step 7 :\(2x^{2} + 3^{2} = 17\)

Step 8 :\(2x^{2} + 9 = 17\)

Step 9 :\(2x^{2} = 8\)

Step 10 :\(x^{2} = 4\)

Step 11 :\(x = 2\) or \(x = -2\)

Step 12 :\(2x^{2} + (-3)^{2} = 17\)

Step 13 :\(2x^{2} + 9 = 17\)

Step 14 :\(2x^{2} = 8\)

Step 15 :\(x^{2} = 4\)

Step 16 :\(x = 2\) or \(x = -2\)

Step 17 :\(\boxed{(2, 3), (2, -3), (-2, 3), (-2, -3)}\)

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Source: https://solvelyapp.com/problems/TjOFkVkikS/

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