Hello, Derek ---

Your second equation is correct, but the first one doesn't match the numbers in the title to your question. The numbers you have -- .08x and .09y -- cannot be correct because either perentage by itself would yield more than 39,000 (the returns would be 80,000 and 90,000).

But if we use ,035 and .045, we can get an answer:

.035x + .045y = 39000

x + y = 1000000

Now multiply the second one all the way through by -.035 so that we can add the two equations and elminate the x variable temporarily:

.035x + .045y = 39000

-.035x - .035y = -35000

___________________________

0 + .01y = 4000

Now multiply through by 100:

y = 400,000

Now substitute back into the first equation to find x:

x + 400,000 = 1,000,000

x = 600,000

**600,000 was invested at 3.5%, returning 21,000. The rest, 400,000 was invested at 4.5%, yielding 18,000. **

William S.

Oh, wonderful, Adriann..."Confusing them with difficult (often unnessary) math skills?" You don't teach students the proper concepts...just let them guess until they find the right number? Using your ridiculous method, how many guesses do you think it might take if the interest total happened to be $39,243.62?03/08/13