Systems of Inequalities 2

Today in class we reviewed about systems of inequalities. We basically did a few problems and did more complicated ones when we got it down. All we have to do is afford not to make mistakes. In problems like these, one simple mistake like forgetting the negative or calculating wrong will not only give you the wrong answer, but cost you a lot of wasted time doing the problem wrong and doing the problem all over again. So now this is the time to be a perfectionist and let nothing distract you from making it perfect. 

Systems of Inequalities

Today in math class we learned about systems if inequalities. Well, more like a review now since we were on Thanksgiving Break and all. Mr. S gave us 7 steps for substitution. 1) pick variable. 2) Solve for variable. 3) Substitute. 4) CLT. 5) Solve. 6) Sub. into original equation 7) Solve. Technically he put 4 steps but I wanted to be very specific and put three extra steps. Now, the moment you've been waiting for...an example!


EX: 2x + 4y = 10
      x + y = 7  isolate your x! --> x = 7 - y
      2(7 - y) + 4y = 10
      14 - 2y + 4y = 10
      14 + 2y = 10
      2y = -4
      y = -2


Then to find your "x" you would put in substitute the "y" into the original equation.


EX: x = (-2) - 7
      x = 9


Then your coordinates are (9,-2). Simple, easy, and quick to do! Just don't mess up on your negatives...the process must be PERFECT!!!

Scatter Plots & Trendlines

Today in math class we learned about scatter plots and trend lines. Trend lines are a line of best fit and scatter plots are just plots scattered on a plane. We also learned that if a graph has two lines that are going up from left to right and are parallel, then it has a correlation. If there is a graph that just has plots scattered then it has no correlation.