The table below shows the number of batches of cookies baked, , and the total weight of cookies, , in grams. The relationship is linear. Which equation shows the relationship between and ?
| Batches baked | Total weight (grams) |
|---|---|
| 4 | 360 |
| 7 | 585 |
| 9 | 765 |
75b - w = -60
75b - w = 60
75w - b = -60
75b + w = 60
