# Help again!! - Practice paper 1 - Q.1.4 - (D)

vic1989
Registered Posts:

**4**
Hi,

Please can someone explain the below and how the answer is worked out! thanks in advance....

The retail shop's delivery costs vary in linear manner and can be expressed using the regression equation

y = a + bx, where x = number of units delivered

The total delivery costs for 200 units and 2,000 units are £5,000 and £14,000 respectively

Calculate the values of a and b

Value of a: 4,000

Value of B: 5

I cant figure this one out....

Please can someone explain the below and how the answer is worked out! thanks in advance....

The retail shop's delivery costs vary in linear manner and can be expressed using the regression equation

y = a + bx, where x = number of units delivered

The total delivery costs for 200 units and 2,000 units are £5,000 and £14,000 respectively

Calculate the values of a and b

Value of a: 4,000

Value of B: 5

I cant figure this one out....

## Comments

90672000-200 = 1800

14000-5000=9000

9000/1800=5.00(B)

200*5.00= 1000

5000-1000=4000 (A)

OR

2000*5.00= 10,000

14,000-10,000=4000 (A)

A=4000

B= 5.00