Computer Project#1                                        Angela A. E.

                                                            Period 1

 

                             -2(-7k+4)+9=-13

 

  1. First, you do distributive property.  So, since negative times a negative equals a positive, and a negative times a positive equals a negative, -2 x –7k= 14k, and

-2 x 4 = -8.  Now, your equation should look like this:  * 14k – 8 + 9 = - 13 *

  1. Now, you need to get the variable by itself.  You can either add the eight, or subtract the nine.  But, what you do on one side, you have to do on the other.  And, I decide to add the eight.

 * 14k –8 + 9 = - 13

                             +8      =  +8

                           14k + 9 =  -5

  1. This time, you have one more number to get the variable by itself.  Now, you have to subtract the nine on both sides.              *14k + 9 = -5

                -9 = -9

                                   14k      = -14

  1.  Since you got the variable on one side by itself, you divide 14 on both sides to get what the variable equals.  *           14k + 9 = -5                    And since –14/14 equals –1, that is                                    

               -9 = -9                     what the variable (k) equals.  

      14k      = -14

      14        =  14

          K      =  -1

  1. Now that your done, you have to make sure your answer is correct.  You have to CHECK IT!!!  In order how to check it; you just have to substitute the answer into the variable.                  

                  * -2(-7k+4)+9 = -13

 -2(-7x-1+4)+9 = -13

  1. You just add up and multiply all the numbers on the left side of the equal sign and see if -13 = -13.  But don’t forget to use the method PEMDAS! (P) Parentheses (e) exponents (m) multiply (d) divide (a) add (s) subtract

 

     -2(-7k+4)+9= -13

 -2(-7(-1)+4)+9 = -13

 -2(7+4)+9      = -13

 -14-8+9        = -13

 -22+9          = -13

 -13            = -13b