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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