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scoundrel [369]
4 years ago
14

Convert the polar equation to rectangular coordinates. (Use variables x and y as needed.)

Mathematics
1 answer:
Vika [28.1K]4 years ago
5 0
I will list first the important conversions and identities that are essential for the solution:

r^2 = x^2 + y^2
x = rcostheta
y = rsintheta

These are the equations when you convert between rectangular and polar coordinates. Also csc theta = 1/sin theta fromtrigo identities. Thus, substituting these equations would yield:

r = 7 csctheta
r = 7/sin theta
√(x^2 + y^2) = 7/(y/r)
√(x^2 + y^2) = 7r/y
y√(x^2 + y^2) = 7r
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Use Point Slope Form since we are given the slope and coordinates. Why is the slope 2x?

<em> </em><em>In</em><em> </em><em>Depth</em><em>:</em><em> </em><em>Parallel lines never touch so</em><em> </em><em>they</em><em> </em><em>are</em><em> </em><em> Lines that have same slope but different y intercept</em><em>.</em><em> An example is a square. A square has four parallel sides. The upper and lower sides will never touch because they are the same slope and they both have a finite distance vertically between them. </em>

<em>Back</em><em> </em><em>to</em><em> </em><em>the</em><em> </em><em>question</em><em>,</em><em> </em><em>let</em><em> </em><em>use</em><em> </em><em>the</em><em> </em><em>Point</em><em> </em><em>S</em><em>lope</em><em> </em><em>Form</em><em>,</em>

<em>y -  y_{1} = m(x -  x_{1})</em>

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<em>Substitute</em><em> </em>

<em>y  - ( - 1) = 2(x - ( - 4)</em>

<em>y + 1 = 2(x + 4)</em>

<em>Simplify</em>

<em>y + 1 = 2x + 8</em>

<em>y = 2x + 7</em>

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