You need both longitude and latitude to find the exact location on a map. Longitude lines/latitude lines. Are lines that run nor
th to south and divide the world into eastern and Western Hemisphere.longitude lines/latitude lines.that run eats to west and divide the world into northern and Southern Hemispheres
Assume that the other number is y. we know that the addition of both number is -9 this means that: x+y=-9 reorder this equation to seperate the y variable: y=-9-x
