2. 职称英语
  3. 4x-2y=6 -6x+5y=7 This problem is a little trickier than the first, as you

4x-2y=6 -6x+5y=7 This problem is a little trickier than the first, as you

游客2025-02-24  17
问题 4x-2y=6      -6x+5y=7
选项
答案  This problem is a little trickier than the first, as you cannot simply change the sign of one of the equations to isolate one of the variables. In this situation, you have to make the coefficients the same through multiplication. Since you know that 4 and 6 both go into 12, use the x term. Multiply the top equation by 3, and the bottom by 2:
     12x-6y=18
   -12x+10y=14
   Add the two equations together (note that the x terms cancel out):
   4y=32
    y=8
   Finally, choose one of the original equations, substitute 8 for y, and solve for x.
[*]
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3970849.html
相关试题推荐
随机试题
最新回复(0)