In the gift shop of the history of flight museum, elisa bought a kit to make a model of a jet airplane. the actual plane is 21 feet long with a wingspan of 17.5 feet. if the finished model will be 10.5 inches long, what will the wingspan be?

8.75 inches

Step-by-step explanation:

We are given that Elisa bought a kit to make a model of a jet airplane

The length of  actual plane=21 feet

The length of wingspan in actual plane =17.5 feet

In the model

Length of airplane=10.5 inches

We know that 1 foot=12 inches

Length of actual plane=

Length of wingspan in actual plane=

If a length of plane is large then length of its wingspan is large and if a plane is short then its wingspan is short also.

It is directly proportional

if x is directly proportional to y

Then  ,x=ky

Let x be the length of wingspan in model

Then, using directly proportional property

Hence,length of wingspan in model=8.75 inches

you can't solve x because it is 2 linear equation and you only have one equation