Question

×+2y=-4
3×-2y=20

3×+y=-5
5×-2y=-1

Answer 1

Resposta:

a)x+2y=-4

3x-2y=20

4x=16

x=16/4

x=4

x+2y=-4

4+2y=-4

2y=-8

y=-8/2

y=-4

b)3x+y=-5 (2)

5x-2y=-1

6x+2y=-10

5x-2y=-1

11x=-11

x=-11/11

x=-1

3x+y=-5

3.-1+y=-5

-3+y=-5

y=-5+3

y=-2