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1. |
When two lines have different slopes, the graphs of the equations are _________ |
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A. |
horizontal lines. |
B. |
parallel lines. |
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C. |
the same line. |
D. |
intersecting lines. |
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Hint |
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2. |
Solve the system of equations by graphing. 
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A. |
(2, 6) |
B. |
(6, 2) |
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C. |
(2, -6) |
D. |
(-6, 2) |
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Hint |
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3. |
Solve the system of equations. 
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A. |
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B. |
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C. |
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D. |
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Hint |
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4. |
Josh has 40 minutes to complete a government exam. There are 15 multiple-choice questions worth 3 points each. There are also 5 short-answer questions worth 11 points each. It takes about 2 minutes for Josh to answer the multiple-choice questions m and about 8 minutes to complete the short-answer questions s. The system of inequalities that represents this problem is graphed below. Which ordered pair is not a vertex of the feasible region? |
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A. |
(0, 5) |
B. |
(0, 0) |
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C. |
(20, 0) |
D. |
(15, 0) |
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Hint |
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5. |
Selena has 31 days to complete her quilt for the county fair. The blue squares in the quilt can be sewn at a rate of 4 squares per day, and the white squares at a rate of 7 squares per day. The quilt can have up to 96 squares total. The blue fabric b costs about $0.80 per square and the white fabric w costs about $1.20 per square. Selena wants to keep costs at a minimum. Write the function that describes the cost of the quilt. |
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A. |
f(b, w) = 4b + 7w |
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B. |
96 = 4b + 7w |
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C. |
96 = 0.80b + 1.20w |
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D. |
f(b, w) = 0.80b + 1.20w |
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Hint |
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6. |
The solution of a system of three linear equations in three variables, x, y, and z, is called a(n) ____ (x, y, z). |
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A. |
sum |
B. |
ordered pair |
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C. |
integer |
D. |
ordered triple |
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Hint |
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7. |
A graph of a system of three linear equations in three variables is shown below. How many solutions does the system have? |
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A. |
1 |
B. |
infinite number |
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C. |
0 |
D. |
2 |
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Hint |
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8. |
Which is true for the following system of equations?
3x -  y = 1
x + 2y = 7. |
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A. |
y > x |
B. |
y = x |
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C. |
y < x |
D. |
cannot be determined from information given |
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Hint |
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9. |
Which graph represents the following system:  |
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A. |
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B. |
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C. |
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D. |
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Hint |
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10. |
Which of the following is not a vertex of the figure formed by  |
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A. |
(0, 2) |
B. |
(2, –1) |
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C. |
(6, 4) |
D. |
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Hint |
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