Question

resolva os sistemas

5×-4y=15

6×-4y=18

Answer 1

5x-4y=15 6x-4y=18

Resolução:

5x−4y=15

5x=15+4y

x=(15+4y)/(5)

6x−4y=18

6·(15+4y)/(5) - 4y =18

6(15+4y)−20y=90

90+24y−20y=90

90+4y=90

4y=0

y=0

x=(15+4y)/(5)

x=(15+4·0)/(5)

x=3

S:{x=3;y=0}