One solution BECAUSE they only intersect once!
Many solutions means they are on top of each other
No solutions means they are parallel to each other!
Answer:

Step-by-step explanation:
The formula of a surface area of a cylinder:

r - radius
H - height
We have r = 40mm and H = 50mm. Substitute:

Y = - 2x - 1
divide everything by 5 and get 2x + y = -5
move the 2x to the right and end up with
y = - 2x - 1
Answer:
all sides have different lengths
and the third angle measures 90⁰