6. Solve the system by substitution.
y=-x +1-1
y=-x-1

Ineed i been stuck on this question since yesterday

Simplify 24÷(-2)(3)+7 a. -29 b. 3 c. 11

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.