anonymous
  • anonymous
solve system of equations. 3x-4y=25 3x+2y=1 A.(1,-1) B.(3,-4) C.(-3,-9) D.(7,-1) hellp this is IMPORTANT
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
do you know matrices
anonymous
  • anonymous
NO
anonymous
  • anonymous
i would suggest then, get one equation and make 3x the subject.

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anonymous
  • anonymous
ok
anonymous
  • anonymous
so 3x=25+4y
anonymous
  • anonymous
now substitute that into the second equation
anonymous
  • anonymous
25+4y+2y=1
anonymous
  • anonymous
ok
anonymous
  • anonymous
cool
anonymous
  • anonymous
6y=-24 y=-4
anonymous
  • anonymous
since y=-4 is the only y-coordinate in B and not the rest then B is ur answer, but check for x-coorindate
anonymous
  • anonymous
ight thanks

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