Which line has an undefined slope? a. x=18 b. 2y-6x=0 c. y=-9 d. y=x

Abaseball team drinks 10/4 gallons of water during a game. which mixed number represents the gallons of water consumed? a) 1 1/2 gallons b) 2 1/2 gallons c) 2 3/4 gallons d) 3 1/2 gallons