1) Resolva os sistemas pelo método de substituição. a) X+Y=4
3X+Y=28

b) 4x+y=0
x+5y=-19

c) -2x-3y=-9
x+4y=12

d) -6x+2y=8
9x-y=8




2) Utilizando o método de adição, resolva:

a) x+7y=-2
-x-4y=-1

b) 3x-y=0
-4x+y=-2

c) 2x+3y=14
-x+5y=-7

d) 3x-5y=-14
-2x-8y=-2
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