Question

d. { 2x - y = 7
(x + 5y = -2
e.
Sxty=5
(-x - y = 2
f.
5x + 3y = -5
2x - y = 4

Answer 1

Explicação passo-a-passo:

2x - y = 7

x + 5y = -2

-y = 7 - 2x

y = (7 - 2x)/(-1)

x + 5(7 - 2x)/(-1) = -2

x + (35 - 10x)/(-1) = -2

-1x + 35 - 10x = 2

-11x = -33

x = 3

y = (7 -2 . 3) / (-1)

y = (7 - 6) / (-1)

y = 1/(-1)

y = -1

5x + 3y = -5

2x - y = 4

3y = -5 - 5x

y = (-5 - 5x)/(3)

2x - (-5 - 5x)/(3) = 4

2x + (5 + 5x)/(3) = 4

6x + 5 + 5x = 12

11x = 7

x = 7/11

y = ( -5 - 5 . 7/11)/3

y = (-5 - 35/11)/3

y = -90/11÷3

y = -30/ 11