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Secondary 1 | Maths
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I am not so sure on how to change the inequality sign. Please have some explanation. Thank you!
Date Posted: 4 years ago
Views: 260
if -4x ≤ 16,
Then -x ≤ 16/4
So -x ≤ 4
This means that -x can be any value equal or smaller than 4.
So for example, 4, 3.5, 3 , 1 ,0 ,-5, -1000 , - 99999.... Etc.
but these are for values of -x. If these are the possible values of -x, then possible values of x are -4, -3.5, -3 -1, 0, 5 , 1000, 99999...
This means x has to be bigger or equal to -4.
Hence x ≥ -4
When we multiply by a negative number (in this case multiply by -1), we change the sign to the other direction.
Then -x ≤ 16/4
So -x ≤ 4
This means that -x can be any value equal or smaller than 4.
So for example, 4, 3.5, 3 , 1 ,0 ,-5, -1000 , - 99999.... Etc.
but these are for values of -x. If these are the possible values of -x, then possible values of x are -4, -3.5, -3 -1, 0, 5 , 1000, 99999...
This means x has to be bigger or equal to -4.
Hence x ≥ -4
When we multiply by a negative number (in this case multiply by -1), we change the sign to the other direction.
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