Find an equation of the line L. L is perpendicular to y=-2x and is passing through points 2,-4

slope of line y= -2x is -2

slope of line L= (-1)reciprocal of slope line y= -2x.

=( -1)(-1/2)

=1/2

since the L passes through (2,-4),

equation of line L: y-(-4)= 1/2(x-2)

2y+8 = x-2

x-2y-10=0

Hence equation of line L is x-2y-10=0

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7