Question

X + 6y =27
7x -3y = 9

Answer 1

Respuesta:

x = 3

y = 4

Explicación paso a paso:

x + 6y =27

7x -3y = 9

aplicamos método de sustitución

x + 6y =27

x = 27 - 6y

7x -3y = 9

7(27 - 6y) - 3y = 9

189 - 42y - 3y = 9

-42y -3y = 9 - 189

-45y = -180

y = -180 / -45

y = 4

7x - 3(4)  = 9

7x -12 = 9

7x = 9 + 12

x = 21/7

x = 3

comprobación

3 + 6(4) =27

3 + 24 = 27

7x -3y = 9

7(3) - 3(4) = 9

21 - 12 = 9