Algebra 2: Investments?

Question

You have $10,000 dollars to invest part at 9% and the rest at 12%. If x is the amount invested at 9% write an algebracic expression that represents the total annual income from both investments.

Answer 1

.09x + .12(10000 - x)

Answer 2

y = x * 9/100 + (10000 - x) *12/100