Answers2025-2026_MDCPS_1205070-MJ Grade 8 Pre-Algebra Sem 1-CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

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Indira created four graphs, each containing a system of equations. She drew only a part of the line for each equation. By inspection, which graph contains a system with infinitely many solutions?

A
On a coordinate plane, lines b and a are parallel.
Option A
B
On a coordinate plane, lines b and a will intersect at 1 point.
Option B
C
On a coordinate plane, lines b and a are on the same line.
Option C
D
.
Option D
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Nico measured the water level in his pool every other day for two weeks. Which statement best describes the information shown by the scatterplot and trend line.

Question illustration
A
As the number of days increased, the water level always decreased.
B
As the number of days increased, the water level always increased.
C
As the number of days increased, the water level usually decreased.
D
As the number of days increased, the water level usually increased.
43

The equation of the trend line on the scatterplot below is . Using the trend line equation, what is the predicted approximate value of y when x = 3.5?

Question illustration
A
2.98
B
4.02
C
4.31
D
5.35
44

Which characteristics describe the scatterplot? Check all that apply.

Question illustration
A
negative correlation
B
positive correlation
C
strong association
D
weak association
E
linear
F
nonlinear
45

Genevieve is buying a car audio system that consists of a stereo, speakers, and amplifiers. She is choosing between 5 types of stereos and 2 types of amplifiers. If she has a total of 30 choices, how many types of speakers must there be?

A
3
B
6
C
10
D
20
46

The system of linear equations and is graphed below.What is the solution to the system of equations?

Question illustration
A
(0, –1)
B
(–1, 0)
C
(0, 1)
D
(1, 0)
47

The table of values below represents a linear function and shows the amount of snow that has fallen since a snowstorm began. What is the rate of change?Snowfall AmountLength of Snowfall(hours)Amount of Snow on the Ground(inches)03.30.54.51.05.71.56.92.08.1

A
1.2 inches per hour
B
2.4 inches per hour
C
3.3 inches per hour
D
5.7 inches per hour
48

Which of the scatterplots have no correlation? Check all that apply.

A
On a graph, points curve up and down.
Option A
B
On a graph, points are grouped together to form a horizontal cluster.
Option B
C
On a graph, points are grouped together to form a vertical cluster.
Option C
D
On a graph, points are grouped together and decrease.
Option D
E
On a graph, points are scattered over the graph.
Option E
49

To find the solution to a system of linear equations, Verdita begins by creating equations for the two sets of data points below.Data Set AData Set BWhich equations could Verdita use to represent the data sets?

Question illustration
A
Data Set A: Data Set B:
Option A
B
Data Set A: Data Set B:
Option B
C
Data Set A: Data Set B:
Option C
D
Data Set A: Data Set B:
Option D
50

According to the scatterplot below, which statement is correct?

Question illustration
A
The input, or dependent variable, is courses completed.
B
The output, or dependent variable, is credits needed to graduate.
C
The input, or independent variable, is credits needed to graduate.
D
The output, or independent variable, is courses completed.

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