Friday

October 31, 2014

October 31, 2014

Posted by **Becca** on Friday, April 12, 2013 at 4:45pm.

For 2x^2 + xy + 2y^2 = 1, find , the angle of rotation about the origin, to the nearest degree.

Find the distance between points at (–1, 6) and (5, –2).

Identify the conic section represented by x^2 – y^2 + 12y + 18x = 42.

Find the coordinates of the points of intersection of the graphs of x^2 + y^2 = 5, xy = –2, and y = –3x + 1.

- Pre-calculus HELP PLEASE ! -
**Steve**, Friday, April 12, 2013 at 4:59pm4x^2 + 9(y^2-2y+1) = 27+9

4x^2 + 9(y-1)^2 = 36

x^2/9 + (y-1)^2/4 = 1

so, the center is at ...

2x^2 + xy + 2y^2 = 1

cot2θ = (A-C)/B

so θ=

d^2 = (5+1)^2 + (-2-6)^2

d = ...

x^2 – y^2 + 12y + 18x = 42

(x^2+18x+81) - (y^2-12y+36) = 42+81-36

(x+9)^2 - (y-6)^2 = 87

so, it's a ...

solving the equations in pairs, we get

(-2,1),(-1,2),(-2/5,11/5),(1,-2),(2,-1)

- Pre-calculus HELP PLEASE ! -
**Becca**, Friday, April 12, 2013 at 5:05pm(2/9, -1 2/4)

?

d=10

ellipse

?

**Answer this Question**

**Related Questions**

Calculus please help ! - Find the coordinates of the center of the ellipse ...

Pre-calculus - For the ellipse with equation 5x^2+64y^2+30x+128y-211=0, find the...

Pre Cal. - 1. Identify the conic section represented by: 9y^2+4x^2 - 108y+24x= -...

Math - How do you solve this by substitution? x=6y+2 3x-18y=4 This is the answer...

pre calculus - 9x^2+25y^2-36x+250y+436=0 what is the center and the vertices of ...

AlgebraII-Reiny could you please check-I'm stuck - Sikve the following by using ...

pre-calculus - the foci of an ellipse are (0,2) (0,-2) and the eccentricity is 1...

Pre-Calculus - I am having trouble with several problems: 1) Find the ...

Pre-Calculus - I am having trouble with several problems: 1) Find the ...

Algebra - Can someone please check my work for me. Q: Plot the graph of the ...