This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Interest at 6% = .06y Our second equation is .08x + .06y = 380 Now we have two equations in two unknowns x + y = 5000 .08x + .06y = 380 I would solve this by elimination x + y = 5000 .08x + .06y = 380 multiply by 100 to clear the decimals x + y = 5000 8x + 6y = 38000 Multiply the top equation by 6 to clear the y column: x + y = 5000 8x + 6y = 38000 6x  6y = 30000 8x + 6y = 38000 Now just add the equations together. The y’s will add up to zero and disappear! 2x = 8000 x = 4000 Now let’s find the amount invested at 6% and check our work x + y = 5000 x = 4000 4000 + y = 5000 y = 1000 Now we have $4000 at 8% and $1000 at 6%. Does this fit our story? Does $4000 at 8% + $1000 at 6% = 380 4000(.08) + 1000(.06) 320 + 60 = 380 We have a winner! Be sure you answer the question! How much was invested at 8%? $4000 was invested at 8%...
View
Full Document
 Spring '11
 filer
 Summer vacation

Click to edit the document details