Answer:
(11, 11)
Step-by-step explanation:
Solve by substitution:
1. set the equations equal to each other

2. simplify

3. substitute the value of x into an equation

Milli means 1000
1 meter=1000 milimeters
therefor
9 times 1 meter=9 times 1000 milimeters
9 meter=9000 milimeters