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Remember the centre of the number line is zero(0)

Number to the right of zero are positive(+)

Numbers to the left of zero are negative(-)

When moving along the number from left to right, then it is Addition.

When moving along the number line from right to left then it is Subtraction.

Here is the numbers line

-infinity .... -10, -9 , -8 , -7, -6, -5, -4, -3, -2, -1, 0 ,1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ... +inifinity.

So we want to make the addition.

-6 + 10 . So start at '-4' count 10 places to the right(addition), you will land on (+)4.

Making the subtraction.

6 - 10 . So start at (+)6, count 10 places to the left(subtraction) , you will land on '-4'.

Hope that helps!!!!

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Then you have a number line with two points labelled on it.

Q: If two points are labeled on a number line?

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Only two points.

In Euclidean geometry each line contains a minimum of an infinite number of points. In projective geometry, though, a line may have as few as two points.

Any piece of a line has an infinite number of points on it, whether it's straight or curved. A line segment is a section of a line bounded by two endpoints. A line is continuous, but a line segment, is a segment of a line.

Any two points have to be on some line.

It is a line segment.

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In principle, yes. The length is the value of the higher label minus the value of the lower label.

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Two. Two points determine a line. Three points determine a plane.

There are an infinite number of points between any two numbers on the real number line.

Only two points.

A line contains an infinite number of points but it takes only two points to determine a line.

If you have two points on a number line, the formula for distance is:|a-b| (|=absolute value)

In Euclidean geometry each line contains a minimum of an infinite number of points. In projective geometry, though, a line may have as few as two points.

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The distance between any two points on a number line is the absolute value of the difference of the coordinates.

A point has no size, and a line is of infinite length, so it contains an infinite number of points. It takes only two points to describe or identify a line, but number of points it contains is infinte. Actually, even a line segment has an infinite number, since it is not possible to get two points so close together that another point won't fit between them.

Any piece of a line has an infinite number of points on it, whether it's straight or curved. A line segment is a section of a line bounded by two endpoints. A line is continuous, but a line segment, is a segment of a line.