Question

2X+6y=12
4X-3y=88

X-2y=24
3X-4y=36

Answer 1

2x + 6y = 12

4x - 3y = 88 * (2)

2x + 6y = 12

8x - 6y = 176

10x = 188

x = 188/10

x = 94/5

2x + 6y = 12

2*(94/5) + 6y = 12

188/5 + 6y = 12

188 + 30y = 60

30y = 60 - 188

30y = - 128

y = - 128/30

y = - 64/15

Resposta: (94/5; -64/15).

x - 2y = 24 *(-2)

3x - 4y = 36

-2x + 4y = - 48

3x - 4y = 36

x = - 12

3x - 4y = 36

3*(-12) - 4y = 36

- 36 - 4y = 36

4y = - 36 - 36

4y = - 72

y = - 72 / 4

y = - 18

Resposta: ( -12, - 18 ).