Question

Steve has a credit account with his local coffee shop. He gets a large coffee every day and a debit of $1.99 is applied to his account. He now owes a total of $11.94. Write a numeric equation using negatives to show the number of days it has been since he last paid his bill.

Answer 1

Therefore a numeric equation using negatives can be written as

-11.94 = -1.94x
`\therefore x = (-11.94)/(-1.99) = 6\hspace{0.1cm}days`

Explanation:

i) Amount owed by Steve = $11.94

ii) For every large coffee Steve has a debit of $1.99 applied to his account

iii) Let x be the number of days it has been since Steve last paid his bill.

therefore a numeric equation using negatives can be written as

-11.94 = -1.94x
`\therefore x = (-11.94)/(-1.99) = 6\hspace{0.1cm}days`.