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4 years ago

I need to solve equations with the system of elimination and the first on is 10x+10y=-10 and rhe second is -9x+2y=-24

Mathematics

1 answer:

irga5000 [103]4 years ago

8 0

$\left\{\begin{array}{ccc}10x+10y=-10&\text{divide both sides by (-5)}\\-9x+2y=-24\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}-2x-2y=2\\-9x+2y=-24\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad-11x=-22\qquad\text{divide both sides by (-11)}\\.\qquad\qquad\boxed{x=2}\\\\\text{Put the value of x to the second equation:}\\\\-9(2)+2y=-24\\-18+2y=-24\qquad\text{add 18 to both sides}\\2y=-6\qquad\text{divide both sides by 2}\\\boxed{y=-3}\\\\Answer:\ \boxed{x=2\ and\ y=-3}$

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natta225 [31]

Answer:

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Step-by-step explanation:

these are the four different symbols that have been used to represent specific statistical measures like for example, mean which is used to calculate the average value of a sample or population. Variance is the what is expected from the squared standard deviation of a random variable from is average vale/ mean. Median is the value that lies in the middle in a random sample and lastly the standard deviation is the square root of the variance and it measures how the values of sample are spread or how far are they from the mean. these are also commonly use in excel a lot to calculate and evaluate data.

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3 years ago

A fast food restaurant sells between 164 and 328 hamburgers per day. If the company profits $82.00 per 82 hamburgers sold, appro

Ahat [919]

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4 years ago

Very easy answer but does any one know what C is

Pavel [41]

Answer: As the number of rides given by the taxi driver increased, the earnings of the taxi driver also increases.

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3 years ago

Read 2 more answers

PLS HELP BRAINLIEST AND EXTRA POINTS !

Svetlanka [38]

Answer:

Step-by-step explanation:

4 + 12 + 18 + 68= 102/2 51

40 + 28 + 52 + 76= 196/2 98

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3 years ago

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One of our brainliest, Konrad509, made this:

Reil [10]

$\dfrac{B_x \sqrt{74_x}}{1D_x}+J_x51_x=4G3_x$

A=10, B=11, C=12, etc.

$\dfrac{11\cdot x^0\cdot \sqrt{7\cdot x^1+4\cdot x^0}}{1\cdot x^1+13\cdot x^0}+19\cdot x^0\cdot (5\cdot x^1+1\cdot x^0)=4\cdot x^2+16\cdot x^1+3\cdot x^0\\\\\dfrac{11\sqrt{7x+4}}{x+13}+19(5x+1)=4x^2+16x+3\\\\\dfrac{11\sqrt{7x+4}}{x+13}+95x+19=4x^2+16x+3\\\\11\sqrt{7x+4}+95x(x+13)+19(x+13)=(4x^2+16x+3)(x+13)\\\\11\sqrt{7x+4}+95x^2+1235x+19x+247=4x^3+52x^2+16x^2+208x+3x+39\\\\11\sqrt{7x+4}=4x^3-27x^2-1043x-208\\\\121(7x+4)=(4x^3-27x^2-1043x-208)^2$

$121(7x+4)=(4x^3-27x^2-1043x-208)^2\\\\847x+484=16 x^6 - 216 x^5 - 7615 x^4 + 54658 x^3 + 1099081 x^2 + 433888 x + 43264\\\\16 x^6 - 216 x^5 - 7615 x^4 + 54658 x^3 + 1099081 x^2 + 433041 x +42780=0$

Now, the "only" thing that remains to do is solving the above equation.

While making this problem I only made sure it has a solution. I didn't try to solve it myself and I didn't know it will end up with such "convoluted" polynomial. Sorry to everyone who tried to solve it... m(_ _)m

I think the best way to approach it is using the rational root theorem since we know that $x\in\mathbb{N}$ . Moreover we can deduce that $x\geq19$ since there is $J$ and $J=19$ .

After you succesfully solve it, you should get the answer $x=20$ .

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4 years ago