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