1)

This equation is of the form , where is the slope and is the -intercept.

Therefore, the slope is and the -intercept is .

2)

Same thing here. Slope is and -intercept is .

3)

Once again, same format. Slope is and -intercept is .

4)

Is this what you mean?

If so, the slope is and the -intercept is .

Basically the same thing for each one.