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2x-5y = -16 ........dikali 5
menjadi :
10x + 4y = 22
10x - 25y = -80 -
29 y = 102
y = 3,5
subtitusi nilai y =
5x + 2y = 11
5x + 2 (3,5) = 11
5x = 11 - 7
5x = 4
x = 4/5
jadi nilai :
5x - 9y = 5(4/5) - 9(3,5) = 4 - 31,5 = -27,5