Posted by **Troy** on Monday, April 7, 2008 at 12:56pm.

Can someone check my answers.

Write the following equations in standard form.

1) x^2 - 2x + y^2 + 4y = 11

answer: (x-1)^2 + (y+2)^2 = 16

2) 4x^2 + 24x - y + 34 = 0

answer: y = 4(x-3)^2 + 2

3) The graph of which equation is a circle?

A. 5x^2 + 10x = 9 + 5y^2

B. 5x^2 - 10x = 0 - 5y^2

C. 5x^2 + 5x + y^2 = 9

answer: C

4)Find the exact solution (s) of each system of equations:

x^2 + y^2 = 25 and 9y = 4x^2

answer: (3,4) (-3,4)

5)Which is the equation of an ellipse with center (-4,2) and a horizontal major axis?

answer: (x+4)^2/16 + (y-2)^2/4 = 1

- Algebra 2 -
**drwls**, Monday, April 7, 2008 at 1:09pm
2 is wrong. Recheck your math regarding the constant.

In 3, C is not a circle because the coefficients of x^2 and y^2 are not equal and not on the same side of the = sign. For a circle, one must to be able to rewrite it as

(x-a)^2 + (y-b)^2 = constant

- Algebra 2 -
**Troy**, Monday, April 7, 2008 at 1:55pm
Would #2 be y=4(x+3)^2-2 and #3 5x^2-10x=0-5y^2?

- Algebra 2 -
**drwls**, Monday, April 7, 2008 at 3:53pm
Yes!

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