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Which system of linear inequalities is represented by the graph?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

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.