1) Resolva os sistemas pelo método da adição, sendo U=Q. a) x-y=1
x+y=9

b) 2x-y=20
2x+y=48

c) 3x+y=0
11x-y=42

d) 3x+3y=21
2x-y=5

e) 5x+y=5
10x-2y=-2

f) 5x-y=4
2x-y=-5

g) 4x-y=2
3x+y=4

h) x+y=1
x-2y=1

i) 5x-2y=1
2x+y=4

j) 2x-4y=-4
5x-3y=2
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