Decide if each pair of lines is parallel, perpendicular, or neither.
1--------------------
2x–3y=18
6x–9y= – 27

2-------------------
5x–y=3
y=1/5x+2

3------------------
3x–8y=4
y= –8/3x+6

4------------------
y+2=3/5(x+15)
5x+3y=18