REASONING 5. Assuming that a≠c, find the x-value of the intersection point of the lines y = ax +b and y = cx+d.

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.