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DIA [1.3K]
2 years ago
14

Someone help me Please!!!

Mathematics
1 answer:
shtirl [24]2 years ago
8 0

Answer: <em>(-2, -1) and (3, 14).</em>

Step-by-step explanation:

\left \Bigg \{ { \bigg{y=x^{2} +2x-1} \atop  \bigg {y-3x=5}} \right. ; \left \Bigg \{ { \bigg{y=x^{2} +2x-1} \atop  \bigg {y=5+3x}} \right.

<em>x² + 2x - 1 = 5 + 3x</em>

<em>x² + 2x - 1 - 5 - 3x = 0</em>

<em>x² - x - 6 = 0</em>

<em />General formula\\\\x=\dfrac{-b \pm \sqrt{b^{2}-4ac } }{2a} \\\\a=1; \: \: b=-1; \: \: c=-6\\\\x=\dfrac{1 \pm \sqrt{(-1)^{2}-4 \cdot1 \cdot (-6)} }{2 \cdot 1}=\dfrac{1 \pm\sqrt{25} } {2} =\dfrac{1 \pm5}{2} \\\\x_{1} = -2\\x_{2} =3<em />

<em>y = 5 + 3x</em>

<em>y₁ = 5 + 3 * (-2) = -1</em>

<em>y₂ = 5 + 3 * 3 = 14</em>

<em>The pair of points representing the solution set of this system of equations is (-2, -1) and (3, 14).</em>

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The number of rainbow smelt in Lake Michigan had an average rate of change of −19.76 per year between 1990 and 2000. The bloater
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Let x =  number of years between 1990 and  2000.

Rainbow smelt:
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Bloater fish
Initial population = 1052
Average yearly rate of change = -92.57
The linear function that models the population is
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When the two populations are equal, then y₁ = y₂.
That is
227 - 19.76x = 1052 - 92.57x
(92.57 - 19.76)x = 1052 - 227
72.81x = 825
x = 11.33 years
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Add x to 1990 to obtain the year April 2011.

Answer:
x = 11.33 years.
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Points are: A= (-2,7)B= (3,5)C= (1,0) To show that the triangle is a right triangle, show that the sum of the squares of the len
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The sum of the squares of the lengths is 58

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From the question, we have

AB² = (-2-3)² +(7-5)²= 25+4 =29

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Here we can see that,

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The sum of the squares of the lengths of two sides (the legs) equals the square length of the third side (hypotenuse).

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Pythagoras Theorem:

In a right-angled triangle, the square of the hypotenuse side is equal to the sum of the squares of the other two sides, according to Pythagoras's Theorem. These triangle's three sides are known as the Perpendicular, Base, and Hypotenuse. Due to its position opposite the 90° angle, the hypotenuse in this case is the longest side. When the positive integer sides of a right triangle (let's say sides a, b, and c) are squared, the result is an equation known as a Pythagorean triple.

To learn more about pythagoras theorem visit: brainly.com/question/343682

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