Question 107149
C-North Carolina's population
Y-New York's population
O-Oklahoma's population
1.{{{C=Y+22000}}}
2.{{{Y=O-187000}}}
3.{{{C+Y+O=437000}}}
Use 2, to get values for C and O in terms of Y,
2.{{{Y=O-187000}}}
{{{O=Y+187000}}}
Nopw I can substitute this answer and equation 1 into equation 3 and solve for Y.
3.{{{C+Y+O=437000}}}
{{{(Y+22000)+Y+(Y+187000)=437000}}}
{{{3Y+209000=437000}}}
{{{3Y=228000}}}
{{{Y=76000}}}
From 1,
1.{{{C=Y+22000}}}
{{{C=76000+22000}}}
{{{C=98000}}}
From 2, 
{{{O=Y+187000}}}
{{{O=76000+187000}}}
{{{O=263000}}}
North Carolina's Native American population is 98,000.
New York's Native American population is 76,000.
Oklahoma's Native American population is 263,000.