Unit Test — Unit test Answers

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21
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Mark is solving the following system.Step 1: He multiplies equation (1) by 7 and adds it to equation (3). Step 2: He multiplies equation (3) by 2 and adds it to equation (2). Which statement explains Mark’s mistake?

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A
He added equation (3) instead of equation (2) in step 1.
B
He did not multiply equation (3) by the same number as equation (1).
C
He did not eliminate the same variables in steps 1 and 2.
D
He added equation the equations in step instead of subtracting them.
22
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What is the solution to the following system?

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A
x = 1, y = –3, z = –1
B
x = 1, y = –3, z = 1
C
x = 1, y = 3, z = 19
D
x = 1, y = 3, z = –2
23

A charity bingo game costs $2 per round and has a $13 entry fee for an adult. It costs $3 per round and a $10 entry fee for a child. For how many rounds of bingo are the costs the same for an adult and a child?

A
2
B
3
C
4
D
5
24

Which statement describes the system of equations?

Question illustration
A
It has one solution (4, –4).
B
It has one solution (8, –9).
C
The system has no solution.
D
The system has infinitely solutions.
25

Which ordered pair (a, b) is the solution to the following system of equations?

Question illustration
A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D

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