Systems of equations substitution method The steps using

Systems of equations: substitution method The steps using the substitution method are shown in the box on HW#2 Solve the system using substitution The sum of two numbers is 20. The difference between three times the larger number and twice the smaller is 40. Verify that your solution is correct. Follow the directions from the box and solve the above system.

Use substitution to solve the system of equations. Check your answers! y = 6 – 3 x 4 x + 2 y = 8 y = 2 x – 4 -6 x + 3 y = -12

Thurs, 3/4 SWBAT… solve systems of equations using the elimination using addition and subtraction method Agenda 1. WU (10 min) 2. 4 Examples – Systems of equations: elimination method (20 min) 3. Work on hw#3 (20 min) 1. What is the solution of the following system of equations? y = 6 x – 1 and y = 6 x + 4 2. Write an equation that will create a system of equations with y = 4 x – 3 that has no solution? HW#4: Elimination using addition and subtraction method

Use substitution to solve the system of equations 1. ) y = 2 x – 4 -6 x + 3 y = -12 2. ) x = y – 1 -x + y = -1

Thurs, 1/12 SWBAT… solve systems of equations using the substitution method Agenda 1. WU (10 min) 2. Review HW#2 (15 min) 3. Quiz: Systems – graphing & substitution method (20 min) WU: Use substitution to solve the system: Twice one number added to another is 18. Four times the first number minus the other number is 12. Find the numbers. HW#3: Substitution method

HW#2: Substitution Answers 1. 2. 3. 4. 5. 6. 7. (5, 10) (0, 2) (2, 0) No Solution Infinite Solution (0, -6) a. ) t = cost of a taco, b = cost of a burrito b. ) 3 t + 2 b = 7. 40 4 t + 1 b = 6. 45 c. ) c = 1. 1, b = 2. 05 d. ) The cost of 2 tacos is $2. 20 and the cost of 2 burritos is $4. 10.