1. Without the diagram, it's 帆册液impossible to solve it.
2. y = 2x + 3, its slope k1 = 2 (coefficient of x)
2y + x = 6 can be changed to y = -x/2 + 3, its slope is k2= -1/2
k1*k2 = -1, so they are perpendicular.
3. It's not said if the rotation is counterclockwise or clockwise, so I assume it's the former.
The rotation of the triangle by 90° counterclockwise is equivalent of the coordination system rotating clockwise by 90°, that's -y becomes +x, and +x becomes +y directions, so it's easy to see R'(-3, -2), S'(-4, 4), T'(2, 2). See diagram.
4.
(1) V = πr²h, r² = V/(πh) = 600π/(12π) = 50
r = 姿前√50 = 5√2 in
(2) V 态物= S*h
S = V/h = 600π/12 = 50π = 157.0796 ≈ 157.1 in²
靠
妈呵!!!!!!!!!!!!