Answer:
price of B is $27 more than A
Step-by-step explanation:
For brand A;
Using the coordinate (2,24) and (4,48)
Slope m = 48-24/4-2
m = 24/2
m = 12
Get the y-intercept
y = mx+b
24 = 12(2) + b
24 = 24 + b
b = 0
The equation will be;
y = 12x
For cost of 9 bottles of A
y = 12(9)
y = $108
For Brand B:
y = 15x
x is the number of bottles
For cost of 9bottles;
y = 15(9)
y = $135
Hence 9 bottles of brand B cost $135
Take the price difference;
Difference = $135 - $108
Difference = $27
Hence the price of B is $27 more than A