Solve 2x-y-2=0 and 4x+3y-24=0 and y+4=0

Need on this one asap im almost done with this subject

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters

What is the answer to the question 5x+2x