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Session 12 In-Class Exercise Solutions

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Q 1. Solve the system by the substitution method: xy = 8 x + y + 6 = 02. Solve the system by the addition method: x2 – 3y = 10 x2 + y2 = 50 3.3. Solve by the method of your choice. 4x2 + y = 0 x3 – y = 0

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1.Step 5: Check at (-2, -4) xy = 8 -2(-4) = 8 8 = 8 True! x + y + 6 = 0 -2 – 4 + 6 = 0 0 = 0 True! Step 5: Check at (-4, -2) xy = 8 -4(-2) = 8 8 = 8 True! x + y + 6 = 0 -4 – 2 + 6 = 0 0 = 0 True! 2.Step 1 Rewrite both equations in the form Ax2 + By2 = C. Step 2 If necessary, multiply either equation or both equations by appropriate numbers so that the sum of the xcoefficients or the sum of the y-coefficients is 0.