SOLUTION: Applications of Linear Equations Walt made an extra $9000 last year from a part-time job. He invested part of the money at 9% and the rest at 8%. He made a total of $770 in inte

Question 164622: Applications of Linear Equations
Walt made an extra $9000 last year from a part-time job. He invested part of the money at 9% and the rest at 8%. He made a total of $770 in interest. How much was invested at 8%?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
.09x+.08(9000-x)=770
.09x+720-.08x=770
.01x=770-720
.01x=50
x=50/.01
x=$5,000 Invested @ 9%.
9000-5000=$4,000 invested @ 8%
Proof:
.09*5000+.08*4000=770
450+320=770
770=770

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