posted by j on .
solve the system by addition:
-5x-9y = -5
I've tried this one over and over, but I can't seem to get the right answer. I don't even really know where to start. each time i try to do it, i go about it a little differently and i'm completely lost, pls help!!
from the second equation:
now sub that back in the first one:
now sub that back into x=-5y-15
first equation .....
-5x - 9y = -5
second equation times 5 ...
5x + 25y = -75
add them, the x's are eliminated
16y = -80
y = -5
substitute that in one of the originals, etc