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3x + 4y = 11 ... pers (2)
Eliminasi pers(1) dg pers (2)
3x + 4y = 11
3x - y = 1
--------------------- - (DIKURANGI)
5y = 10
y = 2
y = 2 di substitusikan ke persamaan
y = 3x -1
2 = 3x - 1
2 + 1 = 3x
3 = 3x
x = 3/3 = 1
maka,2x + 7 y = 2 X 1 + 7 X 2 = 2 + 14 = 16
3x-y=1
3x+4y=11
------------ -
5y= 10
y= 2
y=3x-1
2=3x-1
2+1=3x
3=3×
1=×
maka 2x+7y = 2.1 + 7.2 = 16