Question 929904
x = 2y-9
 -2x+4y = 18
........
-2(2y-9) + 4y = 18
-4y + 18 + 4y = 18
 18 = 18
Infinite solutions. They are Same Line.
.....Note
x = 2y-9
0r
x - 2y = -9
0r
-2(x - 2y = -9) = -2x + 4y = 18 ( same as the second EQ)