Pre algebra question using linear equation ax+b=c to solve

Algebra
Tutor: None Selected Time limit: 1 Day

Kala received a 
 gift card for a coffee store. She used it in buying some coffee that cost 
 per pound. After buying the coffee, she had 
 left on her card. How many pounds of coffee did she buy?
Jul 31st, 2015

Thank you for the opportunity to help you with your question!

ax + b = c

7.53 x + 47.41 = 70

x = 70 - 47.41 / 7.53

   = 22.59 /7.53

   = 3 ...............ANSWER


answer is 

that is she bought 3 coffee

and used 3 *  7.53 = 22.59 pounds 



Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 31st, 2015

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Jul 31st, 2015
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