First, you have to re-order the equations into slope intercept form--
y=mx+b
3x+2y=7
2y=3x+7
y=3/2x+7/2
3y-5x=9
3y=-5x+9
y=-5/3x+9
In the slope intercept form, y=mx+b, m is the variable indicating slope. In this case, Crabtree Hill is steeper, since 5/3 equals 1.66667, while 3/2 equals 1.5. The larger the number, the steeper the slope.