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NCERT Exemplar · Class 8 · Maths

Chapter 12: Introduction to Graphs

Practice each question, then open the answer or worked solution.

Questions

50 questions
Q21Written answer

The y-coordinate of the point (2, 4) is __________.

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Worked solution

Solution: 4 units.

Explanation:

In the ordered pair, the first number always represents the x coordinate, and the second number represents the y coordinate. Hence, the y coordinate is 4 units.

Q22Written answer

In the point (4, 7), 4 denotes the __________.

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Worked solution

Solution: x- coordinate.

Explanation:

The first number in the ordered pair represents the x-coordinate, and the second number represents the y- coordinate.

Q23Written answer

A point has 5 as its x – coordinate and 4 as its y–coordinate. Then the coordinates of the point are given by __________.

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Worked solution

Solution: (5, 4)

Explanation:

The point is represented using the ordered pair = (x coordinate, y coordinate)

Q24Written answer

In the coordinates of a point, the second number denotes the

__________.

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Worked solution

Solution: y coordinate

Explanation:

The second number in the coordinate point represents the y coordinate.

Q25Written answer

The point where the two axes intersect is called the __________.

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Worked solution

Solution: Origin (0, 0)

Explanation:

The two axis intersects at a common point in the graph is called the origin.

In questions 26 to 34, state whether the statements are true (T) or false (F).

Q26Written answer

For fixing a point on the graph sheet, we need two coordinates.

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Worked solution

Solution: True

Explanation:

For plotting a point, we need two coordinates, the x coordinate and the y coordinate.

Q27Written answer

A line graph can also be a whole unbroken line.

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Worked solution

Solution: False

Explanation:

A graph which has whole unbroken lines is called a linear graph.

Q28Written answer

The distance of any point from the x-axis is called the x-coordinate.

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Worked solution

Solution: False

Explanation:

The distance of any point from the x-axis is called the y-coordinate

Q29Written answer

The distance of the point (3, 5) from the y-axis is 5.

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Worked solution

Solution: False

Explanation:

The distance of the point (3, 5) from the y-axis is 3 and from x-axis is 5

Q30Written answer

The ordinate of a point is its distance from the y-axis.

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Worked solution

Solution: False

Explanation:

The ordinate is also known as the y-coordinate, where it is defined as a distance from the x-axis