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December 20, 2014

December 20, 2014

Posted by **saira** on Monday, February 16, 2009 at 5:56pm.

x-y=-5

2x-y=-7

- gr.10 math -
**Reiny**, Monday, February 16, 2009 at 6:09pmarrange the first equation to x = y-5

sub replace the x in the second equation with that expression

2x-y=-7

2(y-5) - y = -7

2y - 10 - y = -7

y = -7 + 10

y = 3 , now let's put that back into x = y-5

x = 3 - 5

x = -2

so x = -2, y = 3

check in the first:

is -2 - (3) = -5 ? , yes!

in the second:

is 2(-2) - (3) = -7 ? , yes!

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