Thuy wrote the system of equations.
24x+36y=72
-16x+By - 80
If the second equation is multiplied by 3, what should the first equation be multiplied by to eliminate the x variable by addition?
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How does central place theory explain patterns in the size and distribution of cities?

Match your vocabulary word to its definition. 1. emigration 2. immigration 3. migration 4. overpopulation 5. sustainable development 6. under population 7. unsustainable development 8. urbanization the movement from one place to another the number of people exceeds the available natural resources in an area leaving one's homeland to settle in a new place the increase in the population of a city the movement of people to a new country the ability to meet current needs without reducing the ability to meet future needs resources being used up at a faster rate than they can be replenished birth rate insufficient to replace the existing population