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raebaby420

  • one year ago

What is a possible first step in eliminating a variable in the following system of equations? x + 7y = –15 2x + 7y = –9

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  1. raebaby420
    • one year ago
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    MY answer choices Multiply the first equation by –1. Multiply the second equation by –1 Multiply the first equation by –2. All of the above

  2. xartaan
    • one year ago
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    Try doing each one... first, do one of your options, like multiply the first equation by -1. Now add it to the 2nd equation and see if a variable disappears. So for the first case, you have \[(x+7y=-15) *(-1)\] which gives you \[-x-7y=15\] If you add that to the 2nd equation, you'll eliminate the 7y. Try for the other 2.

  3. texaschic101
    • one year ago
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    all of the above :)

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