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3x + 4y = 23 -----> dikali 1
===>>>
10x + 4y = 30
3x + 4y = 23
----------------- -
7x = 7
x = 1
====>>>>
3x + 4y = 23
3 + 4y = 23
4y = 20
y = 5
===>>>
(x,y) = (1,5) A
semoga membantu ^_^
3x + 4y = 23 dikalikan 1
10x + 4y = 30
3x + 4y = 23
__________ -
7x = 7
x = 1
3x + 4y = 23
3 + 4y = 23
4y = 20
y = 5
(x,y) = (1,5) A