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x+3y=1 I2I 2x+6y=2
--------------------+
7y=7
y=1
x+3y=1
x+3(1)=1
x=1-3
x=-2
x= -3y + 1........2
subtitusi 2->1
y = 2(-3y+1) + 5
y = -6y+2+5
y+6y = 7
7y = 7
y = 1
y = 2x + 5
1 = 2x + 5
2x = 1-5
2x= -4
x = -2