The range of all real numbers x such that 2x-5 <7 and 4x+10>6 is

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sberi1972 sberi1972

04-07-2018
Mathematics

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The range of all real numbers x such that 2x-5 <7 and 4x+10>6 is

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Which two numbers have a difference of 5 and a product of 3.36???

DeanR DeanR · Answer 1 · 2018-07-04T13:41:25+02:00

DeanR DeanR

04-07-2018

Simultaneous inequalities.

The first one gives

2x -5 < 7

2x < 5+7 = 12

x < 6

The second one

4x + 10 > 6

4x > 6 - 10 = -4

x > -1

Note we always divided by positive numbers, so the sense of the inequaltity never changed.

Our final answer is

-1 < x < 6

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