QuillanH421616 QuillanH421616
  • 03-11-2022
  • Mathematics
contestada

Which of the following options could you do before subtracting the equations so that one variable will be eliminated when you subtract them?

Which of the following options could you do before subtracting the equations so that one variable will be eliminated when you subtract them class=

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SanjayB600891 SanjayB600891
  • 03-11-2022

We need to do something to both equations so we can eliminate one variable

We can multiply the first equation by 3 and the second equation by 4

3( 4x-2y = 7) yields 12x -6y = 21

4( 3x-3y = 15) yields 12x -12y = 60

Now when we subtract

12x -6y = 21

-(12x -12y = 60)

---------------------------

12x -6y = 21

-12x +12y = -60

------------------------

6y = 39

The x terms are eliminated

Choice D multiply the top equation by 3 and the bottom equation by 4

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