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!)

Question

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!)

lgbasallote · Answer

just add the two equations...b gets canceled out

-a = 9
a = -9
b = -7

anonymous · Answer

so  a-b=-2        9+(-7)+(-2)
-2a+b=7           -2(9)+(-7)=2     ?????????

lgbasallote · Answer

^you misplaced the negative signs

anonymous · Answer

where???

lgbasallote · Answer

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 · Answer

Thanks