Graphically solve each of the following.
(a) 3x + y = 6 and x − y = 2
(b) x + 4y = −8 and 3x + 4y = 0
(c) 5x = 3y and y = −5
(d) 2x + 6y = 8 and x = −2
(e) y = 3x − 2 and y = 3
(f) y = −2x and x = 4
(g) x = −2 and 3x + 4y =12
(h) y = −2 and 5x + 3y =15