Question

c)7×-4y=22
2×-4y=8

D) 8×+6y=10
-3×+6y=12​

Answer 1

Resposta:

c) 7×-4y=22

2×-4y=8

7x - 4y = 22,2x - 4y = 8

7x - 2x - 4y + 4y = 22 - 8

7x - 2x = 22 - 8

5x = 14

x = $\frac{14}{5}$

2 x $(\frac{14}{5})$ - 4y = 8

$\frac{28}{5} -$ 4y = 8

-4y = $\frac{12}{5}$

y = $-\frac{3}{5}$

D) 8×+6y=10

-3×+6y=12​

8x + 6y = 10, -3x + 6y = 12

8x + 3x + 6y - 6y = 10 - 12

8x + 3x = 10 - 12

11x = -2

x = $-\frac{2}{11}$

-3$(-\frac{2}{11})$ + 6y = 12

$\frac{6}{11}$ + 6y = 12

6y = $\frac{126}{11}$

y = $\frac{21}{11}$