Question 252956
here are your two original equations:
(i) x - 2y = - 7 
(ii) -4x -1y = 28
multiply (ii) by -2 to get
(i) x - 2y = - 7
(iii) + 8x + 2y = -56
add and solve for x.
(iv) 9x = -63
x = -7.
find y.
y = 0.
(-7,0)