Answer: y = 28x + 15
Step-by-step explanation:
This relationship is linear and so will be of the form;
y = Mx + c
y is the total cost paid
x is the number of days
Assume the points on the line are;
(3, 99) and (6, 183)
Finding M;
= (Y₂ - Y₁) / (X₂ - X₁)
= (183 - 99) / (6 - 3)
= 28
Find c using one of the points and m;
y =Mx + c
99 = 28 * 3 + c
c = 99 - 84
c = 15
Relationship is;
y = 28x + 15