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x-9y = -8
---------------- (-) eliminasi
11y =23
y = 23/11
Subtitusi nilai Y kepersamaan
X+2y = 15
x + 2 (23/11) = 15
x + 46/11=15
x = 15 -46/11
x =
X+2Y=15
X-9Y=-8
________ -
11Y=23
Y=23/11