Answer:
x= 3,-5
Step-by-step explanation:
Answer:


Step-by-step explanation:
Look at the second equation.
Add 6y to both sides:

Hence,

Substitute this into first equation:



Since y = -x,

The polynomial x3+8 = (x+2)(x2-2x+4)
Speed = distance/time
distance = speed * time
let x = time covered by running
15 = run distance + walk distance
15 = 9(x) + 3(3-x)
15 = 9x + 9 - 3x
15 - 9 = 6x
6 = 6x
x = 1 hour
Therefore:
Running distance = speed * time
RD = 9km/hr * 1 hr
RD = 9km