Using the matrix solver on your calculator, find the solution to the system of equations shown below.3x - 5y = 162x - 7y = 7

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.