Parallel and perpendicular gradients

What is the gradient of the line perpendicular to

 $𝑦=5𝑥+2$  

What is the gradient of the line perpendicular to

 $𝑦=\frac{1}{3}𝑥+3$  

What is the gradient of the line perpendicular to

 $𝑦=−7𝑥−4$  

What is the gradient of the line perpendicular to

 $𝑦=-\frac{1}{9}𝑥−6$  

What is the equation of a line parallel to

 $𝑦=99𝑥+4$  

•  $y=-\frac{1}{99}x$  

•  $y=99x$  

•  $y=-99x$  

•  $y=\frac{1}{99}$  

What is the equation of a line parallel to

 $𝑦=\frac{1}{4}𝑥+7$  

•  $y=-\frac{1}{4}x$  

•  $y=4x$  

•  $y=-4x$  

•  $y=\frac{1}{4}x$  

What is the equation of a line parallel to

 $𝑦=-2𝑥-3$  

•  $y=-\frac{1}{2}x$  

•  $y=2x$  

•  $y=-2x$  

•  $y=\frac{1}{2}x$  

What is the equation of a line parallel to

 $𝑦=-\frac{1}{12}𝑥−4$  

•  $y=-\frac{1}{12}x$  

•  $y=12x$  

•  $y=-12x$  

•  $y=\frac{1}{12}x$  

What is the equation of a line perpendicular to

 $𝑦=8𝑥+4$  

•  $y=-\frac{1}{8}x$  

•  $y=8x$  

•  $y=-8x$  

•  $y=\frac{1}{8}x$  

What is the equation of a line perpendicular to

 $𝑦=\frac{1}{13}𝑥+7$  

•  $y=-\frac{1}{13}x$  

•  $y=13x$  

•  $y=-13x$  

•  $y=\frac{1}{13}x$