Suppose p varies directly with d and p= 3 when d= 5. what is the value of d when p= 12

D must equal 20 
when p=3, d= 5 and then p=12 which is an increase of 4 times therefore
when p=12, d= 5x4=20

Where is the diagram?

I’m going to infer you said parallel.solve for yy= -1/2x+7/4lines that are parallel have the same slope, different y intercept.so we know m is -1/2then from there solve for y intercept.