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1. |
If y varies directly as x and y = 21 when x = 5, find x when y = 42. |
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A. |
4.2 |
B. |
10 |
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C. |
21 |
D. |
5 |
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Hint |
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2. |
What is the slope of the line that passes through (8, 4) and (6, 7)? |
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A. |
 |
B. |
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C. |
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D. |
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Hint |
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3. |
Determine the value of r so that the line through (r, 4) and (-7, 7) has a slope of  . |
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A. |
-3 |
B. |
-11 |
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C. |
3 |
D. |
9 |
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Hint |
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4. |
Write the point-slope form of an equation of the line that contains  , which is the hypotenuse of the right triangle. |
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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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5. |
What is implied when it is said that x and y have a negative correlation? |
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A. |
When the value of x increases, the value of y does not necessarily increase or decrease. |
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B. |
When the value of x is negative, the value of y negative. |
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C. |
When the value of x increases, the value of y increases. |
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D. |
When the value of x increases, the value of y decreases. |
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Hint |
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6. |
Write an equation in slope-intercept form of a line with a slope of  and a y-intercept of -2. |
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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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7. |
A direct variation equation has (-2, 4) and (n, -8) as solutions. Find the missing value. |
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A. |
4 |
B. |
1 |
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C. |
16 |
D. |
-2 |
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Hint |
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8. |
Which pair of lines graphed below are parallel? |
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A. |
k and n |
B. |
k and m |
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C. |
l and m |
D. |
l and n |
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Hint |
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9. |
Write an equation of the line shown in the graph. |
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A. |
y = 2x – 5 |
B. |
y = -2x – 5 |
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C. |
y = -2x + 5 |
D. |
y = 2x + 5 |
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Hint |
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10. |
Which equation describes the line that contains the points (6, 2) and (12, 4)? |
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A. |
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B. |
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C. |
y = -3x |
D. |
y = 3x |
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Hint |
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11. |
Which equation describes the line that contains the points (-5, 2) and (3, 7)? |
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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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12. |
Write the point-slope form of an equation for a horizontal line that passes through (-15, 11). |
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A. |
y + 11 = 0 |
B. |
y – 11 = 0 |
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C. |
y + 15 = 0 |
D. |
y – 15 = 0 |
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Hint |
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13. |
Write the slope-intercept form of an equation for a line that passes through (-1, 0) and is perpendicular to the graph of 3x – 5y = 20. |
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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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14. |
Which relationship would most likely have no correlation? |
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A. |
The number of pizzas ordered, and the total price of the bill. |
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B. |
A person's age, and the address of the person. |
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C. |
A person's height and the person's shoe size. |
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D. |
The number of miles driven, and the number of gallons of gas in the car. |
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Hint |
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