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a.)
x+y=4
x+2y=6 / -2y
x=6-2y
6-2y+y=4 / -6
-y=-2 / *(-1)
y=2
x=6-2*2
x=2
b)
2x-4y=2
x+y=4 / -y
2(4-y)-4y=2
x=4-y
8-2y-4y=2 / -8
-6y=-6 /:(-6)
y=1
x=4-1
x=3
c)
y-x=2 / +x
x+2y=11
y=2+x
x+2(2+x)=11
x+4+2x=11 / -4
3x=7 / : 3
x=7/3
y=2+7/3
y=2.7/3
x=2.1/3
y=3.1/3
d)
2x-y=4
x-2y=-1 / +2y
2(-1+2y)-y=4
x=-1+2y
-2+4y-y=4 / +2
3y=6 /:3
x=-1+2*2
e)
2x-5y=2
y-2x=-10 / +2x
2x-5(-10+2x)=2
y=-10+2x
2x+50-10x =2 / -50
-8x=-48 / : (-8)
x=6
y=-10+2*6
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a.)
x+y=4
x+2y=6 / -2y
x+y=4
x=6-2y
6-2y+y=4 / -6
x=6-2y
x=6-2y
-y=-2 / *(-1)
x=6-2y
y=2
x=6-2*2
y=2
x=2
y=2
b)
2x-4y=2
x+y=4 / -y
2(4-y)-4y=2
x=4-y
8-2y-4y=2 / -8
x=4-y
-6y=-6 /:(-6)
x=4-y
y=1
x=4-1
x=3
y=1
c)
y-x=2 / +x
x+2y=11
y=2+x
x+2(2+x)=11
y=2+x
x+4+2x=11 / -4
y=2+x
3x=7 / : 3
x=7/3
y=2+7/3
x=7/3
y=2.7/3
x=2.1/3
y=3.1/3
d)
2x-y=4
x-2y=-1 / +2y
2(-1+2y)-y=4
x=-1+2y
-2+4y-y=4 / +2
x=-1+2y
3y=6 /:3
x=-1+2y
y=2
x=-1+2*2
x=3
y=2
e)
2x-5y=2
y-2x=-10 / +2x
2x-5(-10+2x)=2
y=-10+2x
2x+50-10x =2 / -50
y=-10+2x
-8x=-48 / : (-8)
y=-10+2x
x=6
y=-10+2*6
x=6
y=2