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eliminate the parameter in the equations x=5cos(t) -7 and y=5sin(t)+9. how can the rectangular equation be described?
circle
ellipse
parabola
hyperbola

Answer :

Answer:

the answer is A

Step-by-step explanation:

The parameters represent a circle with a radius of 5 units, centered at (-7,9) and the equation of the circle is (x + 7)² + (y - 9)² = 5².

Deducing the figure from the parameters:

The given equations are:

x = 5cos(t) - 7, and

y = 5sin(t) + 9

if we rearrange the above equations we get:

(x + 7) = 5cos(t), and

(y - 9) = 5sin(t)

Taking square of both equation we get:

(x + 7)² = 25cos²(t), and

(y - 9)² = 25sin²(t)

Now, adding the equations we get:

(x + 7)² + (y - 9)² = 25cos²(t) + 25sin²(t)

(x + 7)² + (y - 9)² = 25

(x + 7)² + (y - 9)² = 5²

This is an equation of a circle with a radius of 5 units and the center at (-7,9)

since, the equation of a circle with radius R units and centered at (a,b) is given by:

(x -a)² + (y - b)² = R²

Learn more about equation of a circle:

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