Our first house is being built, we just went to look at it, and they laid the slab and finished the walls already. Walking around the house, on one side there is a 3 foot section of the slab where it is leaning outward noticeable a couple of inches, as if the 2x6 wood holding in the concrete bent. When the built the walls with concrete blcoks, they kept in straight, so the slab is still sticking out. Is this a problem that needs repair, or tear down and start from scratch?

Try again. The use of the term slab in this context usually refers to a horizontal surface. Do you mean a vertical concrete wall or section that is leaning? Do you mean that the edge of the concrete footer or foundation is bowed out? Is this below or above ground?
Suggest you talk with the builder about you concerns.
Show us a picture.