The number of power plants in the south exceeds that in the west by 11. together they have a total of 73 nuclear power plants. how many are located in the south

Question

This is a modeling algebra question. You can use elimination or substition i think

Answer 1

Let s=number in south and w=number in west.

s-w=11; s+w=73. Add these two equations: 2s=84, s=42, so w=73-42=31.

So there 42 in the south.