Let a be the amount you invest in Account A. So this means you invested 1500 - A in account B. We have the following equation:

05a + (1500 - a).04 = 69.50

Simplifying, we get:

0.05a + 1560 - 0.04a = 69.50

0.01a + 60 = 69.50

Using our equation solver, we get:

**a = 950**

So this means Account B is b = 1500 - 950 =

**550**