Solve the system by substitution x=-y and 8x+3y=40

(8, - 8 )

Step-by-step explanation:

Given the 2 equations

x = - y → (1)

8x + 3y = 40 → (2)

Substitute x = - y into (2)

8(- y) + 3y = 40, that is

- 8y + 3y = 40

- 5y = 40 ( divide both sides by - 5 )

y = - 8

Substitute y = - 8 into (1)

x = - (- 8) = 8

solution is (8, - 8 )

7. d. 64

8. i. 32

9. c. 125

10. j. none of the above

11. d. 81

12. i. 216

13. e. none of the above

14. g. 240

15. e. none of the above

16. g. 32

17.   e. none of the above