CAN SOMEONE HELP PLEASE! A circle has center O(−2, −4) and radius 10. Which of the following points is on the circle?
Hint: d equals square root of left parenthesis x sub one minus x sub two right parenthesis squared plus left parenthesis y sub one minus y sub two right parenthesis squared end square root
A. V(8, −4)
B. X(5, −2)
C. Y(−6, 0)
D. Z(5, 7)
Answers
(x-h)^2+(y-k)^2=r^2
r=10
center=(-2,-4)
(x+2)^2+(y+4)^2=10^2
(x+2)^2+(y+4)^2=100
(x,y)
sub given points (or use TI) and see if you get a true statmeent
A is on it
answer is A
by sub. by this points in the circle equation
for point V(8,-4)
(8+2)^2 + (-4+4)^2 = 100
so the point V lay on the circle
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y-y1=m(x-x1)
They are different, and the conversion depends on what you need.
What you need:
y-y1=m(x-x1)
y-y1=mx-mx1 (distribute the m)
y=mx-mx1+y1 (move the y1)
y=mx+b (combine mx1 and y1)
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b) 10 - √2
c) 7
d) -4
2. Evaluate 6 + √14 + x - √9x when x = 2. (Write as decimal)
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Thank you !
Answers
B. sin 3y= 3( sin 2y)(cos y)
C. sin 4y= 2( sin 2y) ( cos 2y)
D. sin 4y= 4 ( sin 2y) ( cos 2y)
E. sin 8y= 2 ( sin 4y) (cos 2y)