Question

Resolva os sistemas abaixo:

A) x+y=32
x-y=18

B) 6x-3y=20
4x+3y=40

C) 7x+6y=23
5x-6y=21

D) -2x-3y=11
2x+7y=1

E) -9x-15y=-90
25z+15y=170



ME AJUDEM POR FAVOR!!

Answer 1

Boa tarde Bia

A)

x+y=32
x-y=18
2x = 50
x = 25
y = 7

S = (25, 7)

B)

6x-3y=20,
4x+3y=40
10x = 60
x = 6
24 + 3y = 40
3y = 16
y = 16/3

S = (6, 16/3)

C)

7x+6y=23,
5x-6y=21
12x = 44
x = 11/3
55/3 - 6y = 63/3
6y = -8/3
y = -8/18 = -4/9

S = (11/3, -4/9) 

D)

-2x-3y=11,
2x+7y=1
4y = 12
y = 3
2x + 21 = 1
2x = -20
x = -10

S = (-10, 3)

E)

-9x-15y=-90,
25x+15y=170
16x = 80
x = 5
-45 -15y = -90
15y = 45
y = 3

S = (5,3)