Right now I'm down to the last question, but my brain isn't really helping me finish it off. :P
The answer in the book says Y= 1, but I keep on getting Y=2.09
So could you guys help me figure out how to solve it? =[
This is the question:
-2 -3y = x
3x -2y = -17
Find X and find Y.
(Once I find one out, I can easily complete the other. )
And this is how I carry it out:
-2y + 3 (-2 -3y) = -17
-2y -6 = -17 Mr F says: Wrong. It's -2y - 6 - 9y = -17. When you expanded the 3 (-2 - 3y) term, you forgot to multiply the 3 with the -3y .....!!
-11y -6 = -17 Mr F says: Oh .... This is actually correct. So you didn't make the above mistake. You just didn't write it in.
-11y = -23 Mr F says: OK, this is wrong. When you add the 6 to both sides, -17 + 6 = -11, NOT -23. So it should be -11y = -11. It clearly follows that y = 1.
11y/11 = -23/11
Therefore y = 2.09?
But that's not right. =[
Thanks in advance!