Amodel igloo has a scale of 1 in : 2 ft. if
the real igloo is 10 ft wide then how wide is
the model igloo?

The model igloo would be 5 inches wide. I hope this helps you!

Reasoning:

This is because every 2 feet is 1 inch, so 10/2 = 5 inches.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value