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3x-y=1
x=5-2y
3(5-2y)-y=1
x=5-2y
15-6y-y=1
15-7y=1
-7y=14
y=-2
y=-2
x=5-2*-2
x=5+4
x=9
b)2x+y=7
3x-2y=0
y=7-2x
3x-2(7-2x)=0
y=7-2x
3x-14+4x=0
y=7-2y
7x=14
y=7-2y
x=2
y=3
x=2
3(5-2y)-y=1
x=5-2y
15-6y-y=1
x=5-2y
-7y=-14 / :(-7)
y=2
x=5-4
x=1
y=2
2)
2x+y=7
3x-2y=0
y=7-2x
3x-2(7-2x)=0
y=7-2x
3x-14+4x=0
y=7-2x
7x=14 / :7
x=2
y=7-4
x=2
y=3
x+2y =5
3x - y = 1
x = 5 - 2y
3(5 - 2y) - y = 1
x = 5- y
15 - 6y - y = 1
x = 5 - y
- 7y = -14
x = 5 - 2y
y = 2
x = 5 - 4
y = 2
x = 1
y =2
b)
2x + y = 7
3x - 2y = 0
y = 7 - 2x
3x - 2(7 - 2x) = 0
y = 7 - 2x
3x - (14 - 4x) = 0
y = 7 - 2x
3x - 14 +4x = 0
y = 7 - 2x
7x = 14
y = 7 - 2x
x = 2
y = 7 - 4
x = 2
y = 3