2. 外语
  3. 4x-y=63 3y+x=6

4x-y=63 3y+x=6

admin2011-03-08  46
问题 4x-y=63      3y+x=6
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答案 Line up the like terms in both equations: 4x-y=63 x+3y=6 Multiply the top equation by 3 and add the equations: 12x-3y=189 x+3y=6 Note that the y terms cancel out: 13x=195 x=15 Now substitute 15 for x in one of the equations. x+3y=6 15+3y=6 3y=-9 y=-3
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