The slope of y=9x is 9/1 which simplifies to 9
The slope of y=10x-2 is 10/1 which simplifies to 10
The answer is 2.2142857143 but you can round it to 2.
For first pound it is = $2.41
For next six, = 0.41 * 6 = $2.46
Remaining = 7.99 - (2.41 + 2.46) = 7.99 - 4.87 = 3.12
Now, additional pounds = 3.12 / 0.39 = 8
Total weight = 1 + 6 + 8 = 15
In short, Your Answer would be 15 pounds
Hope this helps!
