The combined land area of the countries a and b is 177,973 square kilometers. country a is larger by 773 square kilometers. determine the land area of each country.

Let b = x

a = x + 773

x + x + 773 = 177973

2x + 773 = 177973

2x = 177973 - 773

2x = 177200

x = 177200 / 2

x = 88600

The other is x + 773, = 8860 0 + 773 = 89373

Each country is 88600 and 89373 square kilometers.