Posted by Shirley on Sunday, December 2, 2007 at 2:06pm.
Can someone check my answers?
1. Write the equation of the line that passes through point (–2, 3) with a slope of –4.
Answer: y = -4x - 5
2. Find the slope and y-intercept.
x = –8
Answer: Slope: undefined; y-intercept: none
3. Write the equation of the line which has y-intercept (0, 5) and is perpendicular to the line with equation y = –3x + 1.
Answer: y = 1/3x + 5
4. Write the equation of the line passing through (4, 4) and (4, 2).
Answer: x = 4
5. Determine which two equations represent perpendicular lines.
A. y = 4/7x – 3
B. y = 3x – 4/7
C. y = -1/3x + 4/7
D. y = 1/3x – 4/7
Answer: b and c
6. Find the y-intercept.
–x + 3y = 15
Answer: (0,5)
7. Determine which two equations represent parallel lines.
A. y = 5/3x + 4
B. y = -3/5x – 7
C. y = 2x + 8
D. y = 2x – 4
Answer: c and d
8. Find the slope of the line passing through the points (–7, –4) and (–1, –10).
Answer: -1
9. Find the slope of the line passing through the points (–9, –4) and (0, –4).
Answer: 0
10. Find the slope of the line passing through the points (4, 0) and (4, 5).
Answer: Undefined
11. An employee who produces x units per hour earns an hourly wage of y = 0.35x + 11 (in dollars). Find the hourly wage for an employee who produces 2 units per hour.
Answer: $11.70
12. Which of the ordered pairs
(3, 1), (0, –4), (–4, 0), (–3, –7)
are solutions for the equation x – y = 4?
Answer: (0, –4) and (–3, –7)
13. Find the slope of the line passing through the points (–8, –3) and (–2, 2).
Answer: 5/6
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