I haven't done this in a long time so please bare with me.(adsbygoogle = window.adsbygoogle || []).push({});

I need to solve this system to find the percent abundance of 2 isotopes.

68.9257x + 70.9249y=69.723

x+y=1

In order to solve the system by addition/subraction one would multiply 68.9257 through the second equation, then procede to subract right? I've been doing this, but I haven't been getting the right answer........

Help............

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# Help solving a system of linear equations

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