What is the solution to this system?

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.