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Step-by-step explanation:

1). System of equations is,

  -2x - y = -22 (1)

   4x - 8y = 4 (2)

   By satisfying these equations with the given point (9, 4),

  Equation (1)

  -2(9) - 4 = -22

  -18 - 4 = -22

  -22 = -22

  True.

  Equation (2)

  4(9) - 8(4) = 4

  36 - 32 = 4

  4 = 4

  True.

  Given point lies on both the equations.

  Therefore, the given point is the solution of the system of equations.

2). 3x - 3y = 27 (1)

  -2x + 9y = -11 (2)

  Satisfy the equations with the given point (-10, -1)

  Equation (1)

  3(-10) - 3(-1) = 27

  -30 + 3 = 27

   -27 = 27

   False.

  Equation (2)

  -2x + 9y = -11

  -2(-10) + 9(-1) = -11

   20 - 9 = -11

   11 = -11

   False.

  Therefore, the given point is not the solution of the system of equations given.

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

c.35

step-by-step explanation:

8+13=21

21+8=29

29+6=35