For part of the first year of a dog's life, its growth can be approximated using a linear function. Emilie has two puppies:
a Border collie and a younger Saint
Bernard. During a 4-week period,
the Border collie grows from
13.4 kg to 17 kg, while the Saint
Bernard
grows from 6 kg to 12.4 kg.
Suppose each dog grows at a
constant rate. Will the dogs
ever have the same mass? If
so, approximately what is
the mass?