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jadi masukkan..
x+(x+1)=5
x+x+1=5
2x-1=5
2x=5-1
2x=4
x=2
jadi..
x+y=5
2+y=5
y=5-2
y=3
2. 2x-3y=11 pada 3x+y=0
=> 3x+y=0
y=-3x
masukkan:
2x-3y=11
2x-3(-3x)=11
2x+9x=11
11x=11
x=1
jadi..
2x-3y=11
2(1)-3y=11
2-3y=11
-3y=11-2
-3y=9
y=-3