prealgebra
posted by nay nay .
Use algebra tiles to find the difference. Let one white tile equal +1 and one black tile equal –1.

ok
And then what? 
Use algebra tiles to find the difference. Let one white tile equal +1 and one black tile equal –1.

Use algebra tiles to find the difference. Let one white tile equal +1 and one black tile equal –1.
6 – (–9)