a) x= 3-y
3-y-y= 4
-2y= 4-3
-2y= 1
y= 1/-2
y= -1/2
x= 3-(-1/2)
x= 3+1/2
x= 7/2
b) x= 1-y
1-y-y= -5
1-2y=-5
-2y= -5-1
-2y= -6
y= -6/-2
y= 3
x= 1-3
x= -2
c) x= 15-2y
3(15-2y)-y= -4
45-6y-y= -4
-7y= -4-45
-7y= -49
y= -49/-7
y= 7
x= 15-2.7
x= 15-14
x= 1
espero ter ajudado
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a) x= 3-y
3-y-y= 4
-2y= 4-3
-2y= 1
y= 1/-2
y= -1/2
x= 3-(-1/2)
x= 3+1/2
x= 7/2
b) x= 1-y
1-y-y= -5
1-2y=-5
-2y= -5-1
-2y= -6
y= -6/-2
y= 3
x= 1-3
x= -2
c) x= 15-2y
3(15-2y)-y= -4
45-6y-y= -4
-7y= -4-45
-7y= -49
y= -49/-7
y= 7
x= 15-2.7
x= 15-14
x= 1
espero ter ajudado