Katelyn

Katelyn
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  • I have a question sis. How do you do this inequality? 3x+7>19
  • ok! What you want to do is do the inverse of 7.
  • The inverse?
  • Yeah. What it means is that you do the opposite operation of what you are doing.
  • Oh ok. So you would do negative 7 right?
  • yes, but what you do to one side you must do to the other.
  • Ok. It would then be  3x>12
  • yes! very good. And then you would divide both sides by 3 and you would get x>4
  • Thank you. One more thing. How would you graph it?
  • ok. you want to get the 19 over onto the other side so that it is equal to zero. so subtract the 19 on both sides
  • oh ok and then the -12 is the y intercept so it would be (0,-12) and then 3x is the slope. so I would go up 3 and over 1. rise over run right?
  • yup. Now look at the original equation and pick two points and plug it in. Lets pick points (0,0). 7>19 which is false so you would shade the side with the points (0,0).
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