EXERCISES
        Word Problems, Linear Combination,
                and Sustitution Method's.

 
 
     Use the substitution method to solve these systems.
 
 

1.5m + n = 8              2. 4x + y = 1         3. 4x +12y = 4
  3m - 4n = 14               x - 2y = 16            5x - y = -11

   
          4. 3b - a = -7
             5a + 6b = 14

 Use linear combinations to solve these systems.Clear decimals or fractions as needed.

5. x + 3y = 7       6. x + y = 9       7. 2x + y = 6
  -x + 4y = 7          2x - y = -3          x - y  = 3

       
           8. x - 2y = 6
              -x +3y = -4
 
 
 
 
             Words Problems 
1. The sum of a certain number and a second number is -42.The first  number minus the second is 52. Find the numbers.

2. The difference between two numbers is 16. Twice  the smaller number  plus three times the larger number is 123. What are the numbers?.

3. One day a store sold 30 sweatshirts. Whites ones cost $ 9.95 , and yellow ones cost $10.50. In all , $310.60 worth of sweatshirts were sold. How many of each kind were sold.

4. The perimeter of a rectangle is 86cm. The lenght is 19 cm greater than the width. Find the lenght and the width.
 
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