Y = mx + c
is the formula of a linear line
m is the slope/gradient:
So just take it out from the equation, it’s -2/3
A would be the closest estimate
That is C and B. The missing lengths
16/ 2.10 = 7.6 ounces per $1
20/ 3.15 = 6.3 ounces per $1
So which do you think?