Consider the following planes : x + y + z = 7 , x + 5 y + 5 z = 7

(a) Find parametric equations for the line of intersection of the planes. (Use the parameter t .)

(b) Find the angle between the planes. (Round your answer to one decimal place.)

Consider the following planes : x + y + z = 7 , x + 5 y + 5 z = 7

(a) Find parametric equations for the line of intersection of the planes. (Use the parameter t .)

(b) Find the angle between the planes. (Round your answer to one decimal place.)