tentukan himpunan penyelesaian berikut ini dengan metode golongan subsitutisi dan eliminasi a. 2x + 3y = 6 2x + y = 2 b. x + 3y = 1 2x - y = 9 c. 4x - 2y = 6 5

a
2x + 3y = 6
2x + y = 2
------------- -
2y = 4
y = 2

2x + 3(2) = 6
2x = 0
x = 0

b.
x + 3y = 1.......x2
2x - y = 9....x1
---------
2x + 6y = 2
2x - y = 9
-------------- -
7y = -7
y = -1

x + 3y = 1
x + 3(-1) = 1
x - 3 = 1
x = 4


c.
4x - 2y = 6..... x 5
5 x - 3y = 2.... x4
---
20x - 10y = 30
20x-12y=8
-------------------- -
2y = 22
y = 11


4x - 2y = 6
4x - 2(11) = 6
4x = 28
x = 7

d.
2x - 3y = 7.....x3
3x + 5y = -1 ...x2
------
6x - 9y = 21
6x + 10 y = -2
--------------------- -
-19y = 23
y = -23/19


2x - 3y = 7
2x - 3(-23/19) = 7
x = (7 + 3(-23/19))/2