They are not equivalent fractions.
Answer:
y = 1/2x - 2
Step-by-step explanation:
In order for a line to be perpendicular to another, the lines must have opposite reciprocal slopes.
Example of an opposite reciprocal slope: -2 ⇒ 1/2
Insert the information into the point-slope formula:

Step-by-step explanation:
volume = crossectional area×height
55×21= 1155cm³