Barry’s mountain bike weighs 6 pounds more than andy’s. their bike weigh 42 pound together . write an equation that represent the sum of weigh altogether.

Hi there!

Let b equal the weight of Barry's mountain bike. Let a equal the weight of Andy's mountain bike. 

b - 6 + b = 42

Since Barry's mountain bike weighs 6 pounds more than Andy's, we can say that Andy's mountain bike weighs b - 6 pounds. Since both mountain bikes added together is 42 pounds, b - 6 + b would be equal to 42. 

Hope this helps!

Ithink it is15not sure tho