when you plug in a=2-3/25b in the equation a-1.2b=-3, what are you supposed to get?
I got b=-.76, a=2.09 put it all back in and you get 3
no, I mean what do you get when you do this: 2 - 0.12b - 1.2b = -3.
so is that the equation?
yes.
If you want to know what b equals follow these steps:
2-0.1b-1.2b=-3 (original)
-0.1b-1.2b=-3-2 (rearrange things)
1.3b=5 (add each side, negatives cancel out)
5/1.3=b (solve for b)
b=3.85
Is this the answer you were looking for?
no, i got 5/132.
what did u you do? I am confused....
why is Angie always posting things????!!!
you are right I misread your equation. It was suposed to be 0.12 not 0.1. In that case your answer of 5/1.32 is correct. (I am assuming you forgot the decimal in your last post.)
I'm posting things cuz i suck at math.
I did:
2-0.12b-1.2b=-3
2-1.32b=-3
-1.32b=-3-2
-1.32b=-5
b= -5/1 divided by 1 32/100
b=-5/1 divided by -132/1
b=5/1 * 1/132
b=5/132
If you substitute 5/132 back into the original equation it doesn't work.
You solved and ended up with
1.32b=5
so divide both sides by 1.32 and you get 5/1.32 or 3.79. subsitute it back it in to check your work and it should be correct.