Hello! An intercept is the where the line crosses when either x = 0 or y = 0. Where x = 0, the line crosses through the y-axis at 4. Where y = 0, the line crosses through the x-axis at -8. The intercepts of the line are (0, 4) and (-8, 0).
The answer is 5.2 because if you do 12.60 - 10 it’s 2.6 so you add another 2.6 because it’s 2.6 for a half a pound so if you add the two half of pounds it will add up to one pound so it will be 2.6 + 2.6= 5.2 so basically 5.20$