Homework Help: algebra 1

Posted by Lily on Saturday, July 24, 2010 at 9:50am.

Use elimination to solve the the system of equations given by 10x-4y=-20
and 10x-5y=35.
I can't figure this one out. Whenever I check my work, it is incorrect.

algebra 1 - Reiny, Saturday, July 24, 2010 at 10:28am
when I subtract the last equation from the first, I get

y = -55
sub that back into the first
10x -4(-55) = -20
10x + 220 = -20
10x = -240
x = -24

(those values verify in both equations)
algebra 1 - Lily, Saturday, July 24, 2010 at 10:43am
Thank you! You were a lot of help!
algebra 1 - Anonymous, Wednesday, February 6, 2013 at 10:28pm
-6x+5y=1 6x+4y=-10

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