A few days ago
going_ghost

Math help?

Well, I must face it. I am horrible at math. I was wondering if anyone could help me with these, and show me what you did..

Find the center and radius:

X2 + Y2 + 4X – 4Y – 1 = 0

(the 2’s mean squared..)

Points given: (3,0) & (2,2)

Find point-slope form:

Find slope-intercept form:

Find general form:

Solve:

2X – 3 + 2 ≤ 6X – 4

——–

5

(the 2X – 3 is over 5)

Please help me. You have no idea how thankful I’d be~

Top 2 Answers
A few days ago
supensa

Favorite Answer

a. I forget how to do circles. Sorry!

b. m = (y2 – y1)/(x2 – x1)

m = (2 – 0)/(2 – 3)

m = 2/ -1

m = -2

Slope-intercept form is y = mx + b. Substitute and solve:

0 = -2(3) + b

0 = -6 + b

b = 6

So the equation is y = -2x + 6. The general form is 2x + y = 6, and I think the point-slope form is x = (6 – y)/2. (Don’t hold me to it, I don’t remember point-slope being taught. The others are true.)

c. (2x – 3)/5 + 2 <= 6x - 4 (2x - 3)/5 <= 6x - 6 2x - 3 <= 30x - 30 2x <= 30x - 27 -28x <= -27 x >= 28/27

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A few days ago
ℒ∆υ®єи (HPϟ)
First off, do you have a graphing calculator? That would really help. But if not, try graphing the first equation. From graphing, you can find the different equations. It will be a lot easier. Then, use the two endpoints and use the midpoint formula to find the midpoint, which will be the center. Then, find the distance of the line using the distance formula. Divide that by two and you have the radius.

For the second problem, it is just like a normal equation, only with a different sign. In the end, you should get

x is greater than or equal to 3/28.

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