Problem

HW22 Optımization: Proolem 2 (1 point) Find the point on the line $2 x+1 y-2=0$ which is closest to the point $(-5,-1)$. Answer: Note: You can earn partial credit on this problem. Preview My Answers Submit Answers You have attempted this problem 0 times. You have 10 attempts remaining. Email Instructor

Solution

Step 1 :Let the point on the line \(2x + y - 2 = 0\) be \((x, y)\)

Step 2 :Substitute \(y\) from the line equation to get \(y = -2x + 2\)

Step 3 :Use the distance formula squared to get the function to minimize: \((x - (-5))^2 + (-2x + 2 - (-1))^2\)

Step 4 :Simplify the function to get: \((x + 5)^2 + (3 - 2x)^2\)

Step 5 :Take the derivative of the function with respect to \(x\): \(10x - 2\)

Step 6 :Set the derivative equal to zero and solve for \(x\): \(10x - 2 = 0\), \(x = \frac{1}{5}\)

Step 7 :Substitute \(x\) back into the line equation to find \(y\): \(y = -2(\frac{1}{5}) + 2 = \frac{8}{5}\)

Step 8 :\(\boxed{\left(\frac{1}{5}, \frac{8}{5}\right)}\) is the point on the line closest to \((-5, -1)\)

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