(i)

It has a unique solution at x = 3 and y = 2

Coordinates where lines meet y axis is (0, 4/5) and (0, 8)

(ii)

Unique solution at x = 2 and y = 3.

Lines meet the y axis at (0, 6) and (0, - 2)

(iii)

Unique solution at x = 4 and y = 3

Lines meet the y axis at (0, 11) and (0, -1)

(iv)

Unique solution at x = 3 and y = 2

Lines meet y axis at (0, 7/2) and (0,- 4)

(v)

Unique solution at x = 2 and y = -1

Lines meet the y-axis at (0, 5) and (0, - 5)

(vi)

Unique solution at x = 2 and y = -1

Lines meet y-axis at (0, -5) and (0, -3)