What is the equation of the following direct variation? y = -2x y = -x y = 2x y = x

Need on this geometry question. explain how you did it.

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.