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3x - y = -5 | x1 | 3x - y = -5
---------------------- -
13y = 26
y = 2
x + 4y = 7
x + 8 = 7
x = -1
jadi, x - y = -1-2 = -3
3x - y = -5
Substitusikan nilai x = 4y = 7 ke persamaan 3x - y = -5
=> 3x - y = -5
= 3(7) - y = -5
= 21 - y = -5
-y = -5 - 21 = -26
y = -26/-1 = 26
Jadi, x-y = 7 - 26 = -19
2) 3x - 2y = 17.............(persamaan 1)
x + 4y = -13.............(persamaan 2)
* Persamaan 1 => 3x - 2y = 17
=> 3x = 2y + 17
x = 2y + 17 = 2/3 y + 17/3
3
Substitusikan nilai x = 2/3 y + 17/3 ke persamaan 2
=> x + 4y = -13
= (2/3 y + 17/3) + 4y = -13
14/3 y + 17/3 = -13
14/3 y = -13 - 17/3 = -56/3
y = -56/3 = -168/42 = 4
14/3
Substitusikan nilai y = 4 ke persamaan 1
-> 3x - 2y = 17
= 3x - 2(4) = 17
= 3x - 8 = 17
3x = 17 + 8 = 25
x = 25/3
Jadi, x = 25/3 dan y = 4
Semoga bermanfaat ^_^