Question

3(x-1)+4y=-8
2x+2(y+1)=-2

Answer 1

Răspuns:

x = -3

y = 1

Explicație pas cu pas:

3(x-1) + 4y = -8

2x + 2(y+1) = -2

3x-3+4y = -8

2x+2y+2 = -2

3x+4y= -8+3

2x+2y= -2-2

3x+4y= -5

2x+2y= -4 |×(-2)

3x+4y= -5

-4x-4y= 8

___________(+)

-x=3 => x=-3

2x+2y= -4 |÷2

x+y= -2

-3+y= -2

y= -2+3

y=1