Question

1) Resolva os sistemas abaixo:
y=x-1
y=-2x + 7


y=-2×+5
y=×-1



y=-2×+5
y=2×-7


y=2×-5
y=×-1


​

Answer 1

Explicação passo-a-passo:

1) y=x-1

y=-2x + 7

X-1 . 2x +7

1 1

1(x-1)=1(2x +7)

X-1=2x+7

X-2x=+7+1

-x=+8

X=8

y=-2x + 7

Y= -2.8 +7

Y=16+7

Y=23

V=(8,23)

2) y=-2×+5

y=×-1

-2x +5 . X-1

1 1

1(-2x +5)=1(x-1)

-2x+5=x-1

-2x -x=-1 -5

-x=-4

X=-4

y=-2×+5

Y= -2.4 +5

Y= -8 +5

Y= -13

V=(-4,-13)

3) y=-2×+5

y=2×-7

1(-2x +5) = 1(2x-7)

-2x +5=2x-7

-2x -2x=-7-5

-x=-2

X=-2

y=-2×+5

Y=-2.-2 +5

Y=-4+5

Y=9

V=(-2,9)

4) y=2×-5

y=×-1

1(2×-5)=1(×-1)

2x-5=x-1

2x-x=-1+5

X=6

y=2×-5

Y=2.6 -5

Y=12-5

Y=7

V=(6,7)