It's more easy, from the first question you already know the equations, you want to find S, so you have to find those two equations intersection, which means:
1/2x-1=-2x+9
1/2x+2x=9+1
2.5x=10
x=4
then put x=4 in to any of the equation: y=-2x+9. x=4
y=-2x4+9
y=-8+9
y=1
so the coordinate of S is (4,1)
Okay so if the area is 324 square inches and one of the sides is 12 inches, then you would have to divide the area by the width. so, for your length you would get 27. to find the perimeter, you would add all of the sides together (12+12+27+27) and you would get 78 inches.
Answer: 56
Step-by-step explanation:
Mine is protected view but it could be considered reading view although it might be editing view depending