Since the cost increases $1.40 for each pound increase in seed, the slope is the change in cost/per change in seed weight. 1.4/1 or 7/5 All you need to find is the y intercept. This is obvious since the y intercept is where x (the pounds of seed) is zero. Cost=1.4 times pounds So the linear equation is y=7/5x + 0 So just Y=7/5X The slope is the rate of increase of cost as pounds increases.
+8 
