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Robert is on a diet to lose weight before his Spring Break trip to the Bahamas.  He is losing weight at a rate of 2 pounds per week.  After 6 weeks, he weighs 205 pounds.  Write and solve a linear equation to model this situation.

Question

Robert is on a diet to lose weight before his Spring Break trip to the Bahamas.  He is losing weight at a rate of 2 pounds per week.  After 6 weeks, he weighs 205 pounds.  Write and solve a linear equation to model this situation.

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Solution

Sure, let's break this down:

  1. We know that Robert is losing weight at a rate of 2 pounds per week. This is our slope, or rate of change, often represented as 'm' in the equation of a line, y = mx + b.

  2. After 6 weeks, he weighs 205 pounds. This gives us a specific point on our line, (6, 205).

  3. We can use this information to write our equation. Let's let 'x' represent the number of weeks, and 'y' represent Robert's weight. Our equation becomes: y = -2x + b.

  4. To find 'b', or the y-intercept, we can substitute the point (6, 205) into our equation: 205 = -2(6) + b. Simplifying, we get 205 = -12 + b, and solving for 'b' gives us b = 217.

  5. So, our final linear equation to model this situation is: y = -2x + 217. This equation tells us that Robert started at 217 pounds and is losing 2 pounds per week.

This problem has been solved

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