anonymous
  • anonymous
systems of equation: a-b=-2 -2a+b=7 (okay i get that we have to have a elimination method to solve it but how do we start it? if you know what i mean!)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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lgbasallote
  • lgbasallote
just add the two equations...b gets canceled out -a = 9 a = -9 b = -7
anonymous
  • anonymous
so a-b=-2 9+(-7)+(-2) -2a+b=7 -2(9)+(-7)=2 ?????????
lgbasallote
  • lgbasallote
^you misplaced the negative signs

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anonymous
  • anonymous
where???
lgbasallote
  • lgbasallote
hahahha :)) crazygirl2012....i'm very sorry but the answer I gave was wrong...i was substituting the values to the second equation and it wasn't becoming equal to 7 the correct answer is a = -5 b = -3 I am really really really sorry. Checking: (-5) - (-3) = -2 -5 + 3 = -2 -2 = -2 -2(-5) + (-3) = 7 10 -3 = 7 7 = 7 so you know your values are correct.
anonymous
  • anonymous
Thanks

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