If x + y = a and x - y = b, then x = A.) 1/2(a + b) B.) a + b C.) a - b D.) 1/2ab E.) 1/2(a - b) Solve the two equations simultaneously for x, using the addition method (elimination). x + y = a x - y = b ----------- 2x = a + b {added the two equations together} (a + b) --------- = x {divided both sides by 2} 2 x = 1/2(a + b) {dividing by 2 is the same as multiplying by 1/2} A.) 1/2(a + b) <--- answer - Algebra House
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