2. 职称英语
  3. 4x-y=63 3y+x=6 Line up the like terms in both equations: 4x-y=63 x+3

4x-y=63 3y+x=6 Line up the like terms in both equations: 4x-y=63 x+3

游客2024-01-12  49
问题 4x-y=63      3y+x=6
选项
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
解析
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