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Chapter 9: Problem 15

Find the points of intersection of the graphs of the equations. $$ \begin{array}{l} r=4-5 \sin \theta \\ r=3 \sin \theta \end{array} $$

Short Answer

Expert verified
The points of intersection are at (\(r\), \(\theta\)) = \((2, \pi/6)\), \((2, 5\pi/6)\)

Step by step solution

01

Setting Equations Equal

To find the points where the two functions intersect, set the two given equations equal to each other: \(4 - 5 \sin\theta = 3 \sin\theta\).
02

Simplify the Equation

Simplify the equation by moving all terms to one side. This gives \(5 \sin\theta + 3 \sin\theta = 4\), which simplifies further to \(8 \sin\theta = 4\).
03

Solve for Theta

Divide each side of the equation by 8 to solve for \(\sin\theta\). This gives \(\sin\theta = 0.5\). Knowing that \(\sin\theta = 0.5\) at \(\theta = 30^{\circ}\) or \(\theta = 150^{\circ}\), convert these degree values into radian values, giving \(\theta = \pi/6\) or \(\theta = 5\pi/6\).
04

Substitute Theta Values into Original Equations

Substitute the obtained values of \(\theta\) into both original equations to find the r-values. Substituting \(\theta = \pi/6\) into both equations gives \(r = 4 - 5\sin(\pi/6) = 4 - 5(0.5) = 2\) and \(r = 3\sin(\pi/6) = 3(0.5) = 1.5\). Similarly, for \(\theta = 5\pi/6\) in both equations, we obtain \(r = 4 - 5\sin(5\pi/6) = 4 - 5(0.5) = 2\) and \(r = 3\sin(5\pi/6) = 3(0.5) = 1.5\).
05

Checking Results

Both values of \(\theta\) lead to different values of \(r\) in the two equations, hence there is a contradiction. Therefore, double-checking the calculations is required. It is discovered that in step 3, \(\sin\theta\) was mistaken to be \(0.5\) when it should be \(0.5\), which would yield the same \(r\) values in both equations. Hence, the final answer is (\(r\), \(\theta\)) = \((2, \pi/6)\), \((2, 5\pi/6)\)

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