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Verified answer
A) x + y = 12 subtitusikan ke pers 1x - y = 4 x + y = 12
--------------------- - x + 4 = 12
2y = 8 x = 8
y = 4
b) x + 2y = 3 subtitusikan ke pers 1
-x + 3y = 2 x + 2y = 3
-------------------- + x + 2(1) = 3
5y = 5 x = 1
y = 1
c) 2x + 3y = 5 (x 1) > 2x + 3y = 5
x + y = 2 (x 2) > 2x + 2y = 4
----------------- -
y = 1
substitusikan ke pers 1
2x + 3y = 5
2x + 3(1) = 5
2x = 5 - 3
2x = 2
x = 1