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OCR GCSE Maths Inequalities

Inequalities

This page covers the following topics:

While in an equation the "=" sign indicates that the sides are identical, inequalities are used when they aren't. Different inequalities represent different relationships between the two sides. The definitions of the different symbols that can be used in inequalities are given in the diagram.

Basics of inequalities

Inequalities can be represented on numbre lines, where a hollow dot represents < or >, and a solid dot represents ≀ or β‰₯. To draw a number line, draw a circle over the relevant number, either hollow or solid as appropriate, then draw an arrow in the direction that makes the inequality true, ie. to the left if it is less than or to the right if it is more than.

Number lines

Linear inequalities can be solved just as linear equations using inverse operations, with the only difference being that the inequality sign is kept throughout rather than the "=".

Linear inequalities

To solve quadratic inequalities, rearrange them so that one side is 0. Then solve the corresponding quadratic equation. Sketch the graph of the quadratic equation using the roots and deduce the range of values the variable can take. When the quadratic expression is greater than 0, the wanted region is above the x-axis, and when the quadratic expression is less than 0, the wanted region is below the x-axis.

Quadratic inequalities

When solving inequalities, if it is required to multiply or divide by a negative number, the direction of the inequality sign must be reversed. When there is an expression in terms of the variable that is being solved in the denominator, multiply every term by the square of the expression, so that there is no need to reverse the inequality sign, as this will guarantee that the number that the terms are being multiplied by is positive.

Direction of inequalities

1

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If y > 11, what are the possible values of y? Assume that y is an integer.

OCR GCSE Maths Inequalities If y > 11, what are the possible values of y? Assume that y is an integer.
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2

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If s is an integer and βˆ’2 ≀ s < 2, what are the possible values of s?

OCR GCSE Maths Inequalities If s is an integer and βˆ’2 ≀ s < 2, what are the possible values of s?
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3

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Draw a number line for the inequality x > 9.

OCR GCSE Maths Inequalities Draw a number line for the inequality x > 9.
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4

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Find the set of values of x for which 2x + 6(x βˆ’ 1) β‰₯ 10 and represent them on a number line.

OCR GCSE Maths Inequalities Find the set of values of x for which 2x + 6(x βˆ’ 1) β‰₯ 10 and represent them on a number line.
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5

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Anna has 3 pencils. She receives some more pencils for her birthday. Given that after her birthday the number of her pencils does not exceed 10, draw a number line to show the possible values for the number of pencils Anna has.

OCR GCSE Maths Inequalities Anna has 3 pencils. She receives some more pencils for her birthday. Given that after her birthday the number of her pencils does not exceed 10, draw a number line to show the possible values for the number of pencils Anna has.
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6

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Solve 22x + 8 > 24.

OCR GCSE Maths Inequalities Solve 22x + 8 > 24.
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7

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A rectangle of sides 3x + 4 and 2x + 1 has a perimeter more than 50 but less than 70. Find the range of possible values of x.

OCR GCSE Maths Inequalities A rectangle of sides 3x + 4 and 2x + 1 has a perimeter more than 50 but less than 70. Find the range of possible values of x.
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8

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Solve 11 < 4x + 3 ≀ 35 and show the range of possible values of x on a number line.

OCR GCSE Maths Inequalities Solve 11 < 4x + 3 ≀ 35 and show the range of possible values of x on a number line.
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9

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Solve 50 > 4(8 βˆ’ 2x) βˆ’ x.

OCR GCSE Maths Inequalities Solve 50 > 4(8 βˆ’ 2x) βˆ’ x.
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