Question

5x+4y = 3
20x+10y = 9
Por sustitución

Answer 1

5x + 4y = 3

x = 3 - 4y /5

20x + 10y = 9

x = 9 - 10y /20

3-4y ×(20) = 9-10y ×(5)

60 - 80y = 45 - 50y

-80y + 50y = 45 - 60

-30y = -15

y = -15/-30

y = 0,5

5x + 4 (0,5) = 3

5x + 2 = 3

5x = 3 - 2

5x = 1

x = 0,2