What is the gradient of the line:

 $y=x+7$  

What is the y-intercept of the line:

 $y=3x+6$  

What is the y-intercept of the line:

 $y=x-3$  

What is the y-intercept of the line:

 $y=-2x-7$  

What is the y-intercept of the line:

 $y=-5x$  

What is the y-intercept of the line:

 $y=3-5x$