Question

Determine x e y: a) x + y = 6 x - y = 2 b) 2x - 5y = 11 3x + 6y= 3 c) 3x - 2y = -12 5x + 6x = 8 d) x + y = 10 x - y = 7

Answer 1

Resposta:

a) x+y=6

x=2+y

2+y+y=6

2y=4

y=2

x=4

b) 2x-5y=11

3x+6y=3

5x+y=14

y=14-5x

2x-70+25x=11

27x=81

x=3

y=-1

c) 3x-2y=-12

5x+6x=8

11x=8

8x-2y=-4

5x=12

x=12/5

y=96/10

d) x+y=10

x-y=7

2x=17

x=17/2

y=3/2