Question

JJ joined a fresh food delivery service where he gets a box of fresh fruits and vegetables delivered at home. The service costs

$30 to join, and each box costs $10. Let E represent the food expense related to this service and let B represent the number of
boxes he purchased.
i) Give an equation for E.
ii) Solve the equation you obtained in i) for B.

i) E = 30 + 10B
ii) B = E/10 - 30

i) E = 30 + 10B
ii) B = E-30/10

i) E = 10B
ii) B = E - 10

i) E = 10B
ii) B = E/10

Answer 1

i) E = 30 + 10B

ii) B = E-30/10

Explanation:

From the question, E equals the fruit expense.

That is the sum total cost of entering the service, and the cost of each box bought and the number of boxes bought

B represents the number of boxes bought.

Theresfore :

i- an equation for E would be:

E = ( Cost of joining the service- $30) + ( cost of each box- 10) Multiply by ( number of boxes bought- B)

E = $30 + 10 * B

E = 30 + 10B

ii- let's make 'B' the subject formula from the equation of E.

That is:

E = 30 + 10B

E - 30 = 10B

Divide bought sides by 10 to make 'B' the subject.

B = (E - 30) / 10

B = E-30/10