Question

Resolva o sistema de equações

Answer 1

a) 2x=26

x=26÷2

x=13

13+ y = 20

y= 20 - 13

y=7

b) x= 10 - y

4 (10-y) + 2y = 20

40 - 4y + 2y = 20

- 2y = 20 - 40

- 2y = -20 (-1)

2y = 20

Y= 20 ÷ 2

Y = 10

X= 10 - y

x = 10 - 10

x= 0

C) 3x = 45

x= 45÷3

x=15

15+y= 25

y=25-15

y= 10

D) y=10 - 2x

5x+2(10 - 2x)= 23

5x+20 - 4x = 23

5x - 4x = 23 - 20

X = 3

y=10 - 2x

y = 10 - 2. (3)

y = 10 - 6

y= 4