Algebra Multiple Choice

Hello,

This is the last of questions I have for my practice assignment. Again I will put what I got. Thanks for your help.

1.) Solve the system using substitution. Write answer as an ordered pair.
4x+2y=8
-5x-2=y

A.) First equation (-2,8)
B.) Second equation (-2,8)

I put A

2.) Solve the system using elimination. If the system is linearly dependent, state the general solution in terms of a parameter.

4x-2y+2z=2
-x+y-3z=-4
4x-3y+7z=9

A.) (-1,-7,0)
B.) (3,3,2)
C.) (2z-3, 5z-7, z)
D.) no solution, inconsistent

I got D.

3. Solve using the method of your choice.
y-2^x^2+2x=0
y=4^x+8

A) (4,2^24)
B) (-4, 2^8)
C) (4, 2^24) (-4, 2^8)
D) (4, 2^24) (-4, -2^8)

I got B

asked by Kris
  1. 1. From substitution we get 4-2x= -5x-2

    So, 3x = -6, x=-2, so y = 8: (-2,8)

    2. Should be D

    posted by Knights

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