The answer is : Both plane A and B.
What is the surface area of the solid?
The sum of the area of all of the faces or surface that enclose the solid.
Answer:Under↓↓↓
Step-by-step explanation:
-x=3x-4 (substitute -x for y)
-4x=-4 (Subtract 3x from both sides)
x=1 (Divide both sides by -4)
Since y=x then y=1