Question 1083955
Let A be the amount at 6%, B the amount at 8%.
1.{{{A+B=2100}}}
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.
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{{{0.08*B=0.06*A+28}}}
{{{(4/3)B=A+1400/3}}}
2.{{{A=(4/3)B-1400/3}}}
Substituting from 2 into 1,
{{{(4/3)B-1400/3+B=2100}}}
{{{(7/3)B=(6300+1400)/3}}}
{{{(7/3)B=7700/3}}}
Solve for B, then use either equation to solve for A.