2. 外语
  3. 3x-y= 18 4x=24-6y

3x-y= 18 4x=24-6y

admin2011-03-08  18
问题 3x-y= 18      4x=24-6y
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答案 The first step is rearranging the equations to align like terms: 3x-y=18 4x+6y=24 Multiply the top equation by 6 and add the equations: [*] Now choose one of the original equations, substitute 6 in for x, and solve for y: 3(6)-y=18 18-y=18 -y=0 y=0
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