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Dmitrij [34]
3 years ago
5

Tell weather -3>-x/5; x =10 is a solution of inequality

Mathematics
2 answers:
chubhunter [2.5K]3 years ago
4 0

Answer: \begin{bmatrix}\mathrm{Solution:}\:&\:x>15\:\\ \:\mathrm{Interval\:Notation:}&\:\left(15,\:\infty \:\right)\end{bmatrix}

Step-by-step explanation:

-3>-\frac{x}{5}

-\frac{x}{5}

5\left(-\frac{x}{5}\right)

-x

\left(-x\right)\left(-1\right)>\left(-15\right)\left(-1\right)

x>15

hichkok12 [17]3 years ago
3 0

Hey there! :)

To find if the solution is a part of the Inequality, we can do by using two methods.

  • Solve The Inequality — ( 1 )
  • Substitution and Compare — ( 2 )

<u>S</u><u>o</u><u>l</u><u>v</u><u>e</u><u> </u><u>T</u><u>h</u><u>e</u><u> </u><u>I</u><u>n</u><u>e</u><u>q</u><u>u</u><u>a</u><u>l</u><u>i</u><u>t</u><u>y</u>

We are given the Inequality:

\displaystyle \large{ - 3 >  -  \frac{x}{5} }

Our goal is to isolate x-term. Since there's 5 as a denominator, what we have to do is to get rid of it by multiplying whole Inequality by 5.

\displaystyle \large{ - 3 \cdot 5 >  -  \frac{x}{5} \cdot 5 } \\  \displaystyle \large{ - 15>  -  x}

Since -x is equivalent to -1x.

\displaystyle \large{ - 15>  -  1x}

Divide both sides by -1. Do not forget to swap the sign from > to < if we are dividing both sides by negative numbers.

\displaystyle \large{  \frac{ - 15}{ - 1} >    \frac{ - 1x}{ - 1} } \\  \displaystyle \large{  15 <  x}

Switch 15 < x to x > 15.

\displaystyle \large \boxed{x > 15}

Since x > 15, that means if we substitute x = 10, we'd get 10 > 15 which is false.

Hence, x = 10 is not a part of the Inequality.

<u>S</u><u>u</u><u>b</u><u>s</u><u>t</u><u>i</u><u>t</u><u>u</u><u>t</u><u>i</u><u>o</u><u>n</u><u> </u><u>a</u><u>n</u><u>d</u><u> </u><u>C</u><u>o</u><u>m</u><u>p</u><u>a</u><u>r</u><u>e</u>

From the Inequality, substitute x = 10 in.

\displaystyle \large{ - 3 >  -  \frac{10}{5} }

Simplify:

\displaystyle \large{ - 3 >  - 2}

As we know that -3 is less than -2 and not greater. The Inequality is false.

Therefore, x = 10 is not a part of the solution.

Answer

  • x = 10 is not the solution to this Inequaliy.

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