Resolva os sistemas:
A) x+y=17
-2x+3y=6
B)2x+y=-13
x-y=-2
C) -3x+2y-11
-5x-y=14
A) x+y=17
-2x+3y=6
B)2x+y=-13
x-y=-2
C) -3x+2y-11
-5x-y=14
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Olá,Vamos lá,
A) x+y=17
-2x+3y=6
x +y=17
x=17-y
-2x+3y=6
-2(17-y)+3y=6
-34 +2y + 3y = 6
5y = 6 + 34
5y =40
y=40/5
y=8
x+y=17
x +8=17
x= 17-8
x=9
Resposta:x=9 e y=8
B)2x+y=-13
x-y=-2
x-y=-2
x=-2+y
2x+y=-13
2(-2+y)+y=-13
-4 +2y+y=-13
3y = -13 +4
3y = -9
y= -9/3
y= -3
agora acharemos x:
x-y=-2
x - (-3)=-2
x +3 = -2
x = -2-3
x=-5
Resposta: x=-5 e y=-3
C) -3x+2y=11
-5x-y=14
-5x-y=14
-y=14 +5x *(-1)
y = -14 -5x
-5x-y=14
-5x - (-14 -5x)=14
-5x +14 + 5x = 14
-5x +5x = 14 -14
0 = 0
y = -14 -5x
y = -14 -5*0
y = -14
Resposta:x=0 e y=-14