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  • How much longer until we get home?
  • Well, when we were in the card for 10 minutes, we were 11km from home. Then, when we were in the car for 15 minutes, we were 8km from home.
  • How does that tell me when we are going to be home?
  • You have to use the equation y=mx+b
  • y=mx+b m is the slope and b is the y-intercept. To solve for m, you have to use the equation y(2)-y(1)/x(2)-x(1). m= -3/5 b=17, so the equation used to solve this problem is y= -3/5x + 17, where x is the minutes driving and y is the kilometers from home.
  • y=mx+what?
  • Ok, so the equation y= -3/5x + 17 means that after 0 minutes of driving, we are 17km from home. Every kilometer, we are .6 minutes closer to home.
  • By the time you're done, we will already be home.
  • Hold on, I got this. So based on that information, it should take us 28 minutes and and 20 seconds to get home.
  • Wow, I think you actually figured it out. Congrats.
  • But we're already home, so you didn't need to solve that problem
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