rebecca1233 3 years ago Which system has (1, 3) as the solution? Which system has infinite solutions? Which system has (-8, 0) as the solution? Which system has no solutions? Which system has (-2, -2) as the solution? A) x + y = -1 4x + 4y = -4 B) x - 4y = -8 2x - 3y = -16 C) x + y = -4 -3x + 2y = 2 D) 4x + 6y = -12 2x + 3y = 9 E) x - y = -2 3x - y = 0

1. annas

A) 4x+4y=-4(multi eq 1 with 4) 4x+4y=-4 subtract both eq we'll get 0 = 0

2. rebecca1233

thats a right ?

3. rebecca1233

wait thats the 4th one so A= 4

4. rebecca1233

or a = 2

5. annas

B) 2x - 8y = -16(multi eq1 with 2) 2x - 3y = -16 subtracting both eqs -5y = 0 y=0 x= -8 (-8,0)

6. annas

A system of eq has no solution

7. rebecca1233

so A= is the 4th one like i said

8. annas

yes

9. rebecca1233

what bout the other two

10. annas

can you solve the rest ???

11. rebecca1233

Which system has (1, 3) as the solution?

12. annas

B system of eq has solution set = (-8,0)

13. rebecca1233

E) x - y = -2 3x - y = 0

14. rebecca1233

that is correct right ?

15. annas

wait

16. annas

E) x - y = -2 3x - y = 0 subtracting both eqs -2x=-2 x= 1 y=3 (1,3) yes E has solution set (1,3)

17. rebecca1233

Thought so..

18. rebecca1233

is c the last option

19. annas

C)2x +2 y = -8(multi with 2) -3x + 2y = 2 subtract both eqs 5x=-10 x= -2 y=-2 (-2,-2) C has solution set (-2,-2)

20. rebecca1233

so i am right :)

21. annas

yes :)

22. rebecca1233

then D is the second one

23. annas

D) 4x + 6y = -12 4x + 6y = 18(multi by 2) subtract both eqs 0 = -30 so D has infinite solutions