SOLUTION: help me with the substitution method word problems. ----------- ----------- ----------- ----------- ---- Mrs. brighton invested $30,000 and received $2300.00 in interest. If s

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Question 37309This question is from textbook Elementary and intermediate Algebra
: help me with the substitution method word problems.
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Mrs. brighton invested $30,000 and received $2300.00 in interest. If she invested part of the money at 10% and the remainder at 5%, then how much did she invest at each rate ?
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tickets for a concert we're sold to adults for $3.00 and to students at $2.00. If the total receipts we're $824.00 and twice as many adult tickets as student tickets we're sold, then how many of each we're sold ?
This question is from textbook Elementary and intermediate Algebra

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
.1X+.05(30000-X)=2300 OR .1X+1500-.05X=2300 OR .05X=2300-1500 OR .05X=800 OR
X=800/.05 OR X=16000 OR $16000 INVESTED @ 10% & 30000-16000=$14000NVESTED @5%
2A*3+A*2=824 OR 6A+2A=824 THEN 8A=824 OR A=103 STUDENT TICKETS@2=$206
AND 2*103*3=$618 AND $206+$618=$824