alg.
posted by j
solve the system by addition:
5x9y = 5
x+5y=15
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:
x=5y15
now sub that back in the first one:
5(5y15)9y=5
25y+759y=5
16y=575
16y=80
y=5
now sub that back into x=5y15
x=5(5)15
x=2515
x=10
OR
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
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