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Oksana_A [137]
2 years ago
5

Please help, thanks if you do :)

Mathematics
2 answers:
slega [8]2 years ago
8 0
(2,3)
Usbkehisbdhdkd
grandymaker [24]2 years ago
5 0

Answer:

(2,3)

Step-by-step explanation:

substituting y we get 4.5x=9 so x=2, with this we can plug x back into one of the equations to solve for y, which is 3

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Consider a circle whose equation is x2 + y2 + 4x – 6y – 36 = 0. Which statements are true? Check all that apply. To begin conver
umka21 [38]

Answer:

1) False, to begin converting the equation to standard form, each side must be added by 36. 2) True, to complete the square for the x terms, add 4 to both sides, 3) True, the center of the circle is at (-2, 3), 4) False, the center of the circle is at (-2, 3), 5) False, the radius of the circle is 7 units, 6) False, the radius of the circle is 7 units.

Step-by-step explanation:

Let prove the validity of each choice:

1) To begin converting the equation to standard form, subtract 36 from both sides:

Let consider the following formula and perform the following algebraic operations:

(i) x^{2} + y^{2} + 4\cdot x - 6\cdot y  - 36 = 0 Given

(ii) x^{2} + 4\cdot x + y^{2} - 6\cdot y - 36 = 0 Commutative Property

(iii) (x^{2} + 4\cdot x + 4) - 4 + (y^{2} - 6\cdot y + 9) - 9 -36 = 0 Modulative/Associative Property/Additive Inverse Existence

(iv) (x+ 2)^{2} - 4 + (y - 3)^{2} - 9 - 36 = 0  Perfect Trinomial Square

(v) (x+2)^{2} +(y-3)^{2} = 4 + 9 + 36 Commutative Property/Compatibility with Addition/Additive Inverse Existence/Modulative Property

(vi) (x+2)^{2} + (y-3)^{2} = 49 Definition of Addition/Result

False, to begin converting the equation to standard form, each side must be added by 36.

2) True, step (iii) on exercise 1) indicates that both side must be added by 4.

3) The general equation for a circle centered at (h, k) is of the form:

(x-h)^{2}+ (y-k)^{2} = r^{2}

Where r is the radius of the circle.

By direct comparison, it is evident that circle is centered at (-2,3).

True, step (vi) on exercise 1) indicates that center of the circle is at (-2, 3).

4) False, step (vi) on exercise 1) indicates that the center of the circle is at (-2, 3), not in (4, -6).

5) After comparing both formulas, it is evident that radius of the circle is 7 units.

False, the radius of the circle is 7 units.

6) After comparing both formulas, it is evident that radius of the circle is 7 units.

False, the radius of the circle is 7 units.

5 0
3 years ago
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RoseWind [281]

Answer:

2x + 4y = 12 and y = -1/2x + 3

6 0
3 years ago
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Help quick urgently
Setler [38]

Answer:

We need a more clearer image all we have are add subtract and multiply and there are no definitions or numbers

Step-by-step explanation:

We need a more clearer image all we have are add subtract and multiply and there are no definitions or numbers

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3 years ago
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D. During a promotional weekend, a state fair gives a free admission to every
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Answer:

69 people got in free over the 2 days

Step-by-step explanation:

6742/175=38

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31+38=69

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5 over 8 subtract by negative 7 over 8
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1.5 or 1 1/2. I hope this helped you!
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