123jjyolo 123jjyolo

24-09-2019
Mathematics

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algebra EXTRA POINTS!
Solve the system using elimination.
5x+ 4y = 12
3x- 3y = 18
Thanks in advance!!

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kincsob kincsob

24-09-2019

Answer: : x = 4 and y = -2.

5x + 4y = 12 /*3

3x - 3y = 18 /*4

_____________

15x + 12y = 36

12x - 12y = 72

_____________

15x + 12y + 12x - 12y = 36 + 72

15x + 12x = 36 + 72

27x = 108

x = 108/27

x = 4

3x - 3y = 18

3 * 4 - 3y = 18

12 - 3y = 18

12 - 18 = 3y

3y = -6

y = -6/3

y = -2

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