y = 0That's the equation of the x-axis.Its slope is zero.
x = -3 represents a vertical line whose slope is undefined.
The slope is 5. Parallel lines always have the same slope.
The slope would be 3/4
It is: -1/2
the slope will be positive 1.5x the whole equation is y=4.5+1.5x
1, it will have the same slope but the y intercept will be different.