Solve this system of linear equations without graphing:
5x + 4y= 8
10x – 4y = 46

x=3.6; y=-2.5

Step-by-step explanation:

To solve this pair of equations, we can use elimination method.

5x+4y=8

10x-4y=46

Add both equations together to cancel out 4y.

15x=54               [divide both sides by 15]

x=3.6

Now that we know x, we can plug it back into any equation to find y.

5(3.6)+4y=8       [multiply]

18+4y=8             [subtract both sides by 18]

4y=-10                [divide both sides by 4]

y=-2.5

Now, we have x=3.6 and y=-2.5.

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

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21

-7 + ? = 21

-7 + 28 = 21

hope it