Question

Encontre o valor de x, sendo que y = 3.
10x – 2y = 0
x – y = – 8
7x + y = 5
12x + 5y = – 10
50x – 6y = 32
8x + 11y = 12

Answer 1

10x - 2y = 0 7x + y = 5

10x - 2 • 3 = 0 7x + 3 = 5

10x - 6 = 0 7x = 5 -3

10x = 0 + 6 7x = 2

10x = 6 x = 2 ÷ 7

x = 6 ÷ 10 x = 0,285714285714

x = 0,6

x - y = -8 12x + 5y = -10

x - 3 = -8 12x + 5 • 3 = -10

x = -8 + 3 12x + 15 = -10

x = -5 12x = -10 -15

12x = -25

50x - 6y = 32 x= -25 ÷ 12

50x - 6 • 3 = 32 x= −2,08333333333

50x - 18 = 32

50x = 32 + 18

50x = 50

x= 50 ÷ 50

x = 1

8x + 11y = 12

8x + 11 • 3 = 12

8x + 33 = 12

8x = 12 + 33

8x = 45

x= 45 ÷ 8

x= 5,625