#### Answer

x+y = 6500
x-y=800

#### Work Step by Step

Let x be one account and y be the second account. Since there is 6500 in both accounts combined, adding x and y will give 6500.
x+y = 6500
Let's say x is the larger account. It has 800 more than the smaller account, y. So if we take away 800 (x-800) from x, we will be equal to y.
x-800=y
Rearrange y and 800 to the other sides:
x-y=800
And the answer is:
x+y = 6500
x-y=800