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ilovenyc

  • 3 years ago

Solve -2x + 1 less than or greater to -7 and describe the graph of the solution. A x less than or greater to 4; closed circle on 4, shading to the left B x greater than or equal to 4; closed circle on 4, shading to the right C x greater than or equal to 4; open circle on 4, shading to the right D x less than or greater to 4; open circle on 4, shading to the left

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  1. Stiwan
    • 3 years ago
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    I'll look at the cases separately (though they're very similar): - 2x +1 < -7 | -1 -2x < -8 | : (-4) x > 4 (< becomes > when multiplying with a negative number) That means if -2x +1 < -7 is true, it follows that x is greater than 4. -2x+1 > -7 | -1 -2x > -8 | :(-4) x < 4 (> becomes < when multiplying with a negative number) That means if -2x +1 > -7 is ture, it follows that x is smaller than 4. Hence, the inequality is true if x is not 4. This means that your solution is anything except 4. I'm not quite sure what you mean by "closed/open" circle or "shading to the left", but if it means what I think it means then it is an open circle. I have no idea what "shading to the left" means. Sorry, English is not my native language.

  2. Stiwan
    • 3 years ago
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    But anyway, I'm quite sure that the right answer is D

  3. ilovenyc
    • 3 years ago
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    @Stiwan thank you!

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