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............

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Help solving a system of linear equations

**Physics Forums | Science Articles, Homework Help, Discussion**