The equation of a circle is written as ( x-h)^2 + (y-k)^2 = r^2
h and k is the center point of the circle and r is the radius.
In the given equation (x+3)^2 + (y-1)^2 = 81
h = -3
k = 1
r^2 = 81
Take the square root of both sides:
r = 9
The center is (-3,1) and the radius is 9
<span>4x+7y=51
Plug in </span><span>y=5::
4x+7(5)=51
Simplify:
4x+35=51
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<span>4x+35-35=51-35
4x=16 (÷4)
x=4
Done :)
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I hope that
helps!
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Answer:
Step-by-step explanation:
<u>Use trigonometry:</u>
- tangent = opposite / adjacent
- tan x = 34/54
- x = arctan (34/54) ≈ 32.2°
X + y = 0
x = - y
x- y = -16
y = x + 16
Answer:
6 lb
Step-by-step explanation:
3x2