Name:___________________________ Period:_______Date:_______________ Solving Systems of Equations by Substitution
Section I. Solve the system of linear equations by using substitution 1. ! = 3! − 4 ! = 4 + ! 4, 8 3. ! − 2! = 4 ! + 4! = 7 !
5, ! 5. ! + ! = 8 ! = ! − 2 5, 3 7. 4! − ! = −3 ! = 9! − 7 2, 11 2. ! = ! − 5 ! + 3! = −3 4. ! = ! − 5 !
! = ! ! − 1 6. 3! − ! = 10 2! + ! = 0 8. ! = 3! ! + ! = 28 3, −2 8, 3 2, −4 7, 21 9. ! + 4! = −8 3! + 2! = 6 4, −3 11. 3! − ! = 7 4! − 5! = 2 3, 2 13. ! + 2! = 4 2! + 4! = 8 infinite solutions 15. ! − 4! = 2 2! − 8! = 16 no solutions 10. 3! − 2! = −3 3! + ! = 3 12. 2! − ! = 7 3! + 4! = 5 14. 3! − 4! = 17 ! + 2! = −1 16. ! + 3! = 27 !
! ! + 2! = 19 !
! , 2 3, −1 3, −2 −6, 11