If x + y = 12 and 3x - y = 20, find the value of 2x - y
8
10
12
15
Correct answer is C
x + y = 12 + 3x - y = 20 --------------- 4x = 32 x = 8 x + y = 12; 8 + y = 12; y = 12 - 8 = 4 2x - y = 2(8) - 4; 16 - 4 = 12
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