{ax+3y=10 kx−3y=6 In the system of equations above, a and k are constants. If the solution to the system is (2,1), what is the value of a+k ?

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Me n o w. i need t h i s. 10 points

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.