//5. Use substitution to solve the system of equations 3x - y = 4
2x - 3y = 9
Solution: (
)

(3,5)

Step-by-step explanation:

y=3x-4

2x-3y=-9

2x-3(3x-4)=-9

2x-9x+12=-9

7x=21

x=3

y=3(3)-4

y=5

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50

i believe the answer is the polygon, heptagon.