Consider that a woman has $500,000 invested in two rental properties. One yields an annual return of 12%$ of her investment, and the other returns 15% per year on her investment. Her total annual return from the two investments is $64,500.

And suppose that x represents the 12% investment and y represents the 15% investment.

(a) Let us write an equation that states that the sum of the investments is $500,000.

Since x represents the 12% investment and y represent the 15% investment.

Thus, the equation that states the sum of the investments is.