On which number line are −6 and its opposite shown? Number line from negative 10 to positive 10 in increments of 1 is shown. Only the whole numbers are labeled. A solid, blue point is placed on the 6th tick mark to the left of 0. A solid, blue point is on 0. Number line from negative 10 to positive 10 in increments of 1 is shown. Only the whole numbers are labeled. A solid, blue point is placed on the 6th tick mark to the left of 0. A solid, blue point is on the 6th tick mark to the right of 0. Number line from negative 10 to positive 10 in increments of 1 is shown. Only the whole numbers are labeled. A solid, blue point is placed on 0. A solid, blue point is on the 6th tick mark to the right of 0. Number line from negative 10 to positive 10 in increments of 1 is shown. Only the whole numbers are labeled. A solid, blue point placed on the 6th tick mark to the left of 0. A solid, blue point mark is on the 3rd tick mark to the left of 0.