Q. The pair of lines represented by the equation 2x^2 - 3xy + y^2 = 0 has slopes m1 and m2. What is the product m1*m2?
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Solution
The product of the slopes of the lines is given by m1*m2 = c/a = 1/2 = -2.
Correct Answer: A — -2
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Q. The pair of lines represented by the equation 4x^2 - 12xy + 9y^2 = 0 are:
A.
Parallel
B.
Intersecting
C.
Coincident
D.
Perpendicular
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Solution
Factoring gives (2x - 3y)(2x - 3y) = 0, indicating the lines are coincident.
Correct Answer: D — Perpendicular
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Q. The pair of lines represented by the equation 5x^2 + 6xy + 2y^2 = 0 has:
A.
Two distinct real roots
B.
One real root
C.
No real roots
D.
Infinite roots
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Solution
The discriminant of the quadratic equation is positive, indicating two distinct real roots.
Correct Answer: A — Two distinct real roots
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Q. The pair of lines represented by the equation 5x^2 + 6xy + 5y^2 = 0 are:
A.
Real and distinct
B.
Imaginary
C.
Coincident
D.
Real and coincident
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Solution
The discriminant of the quadratic equation is negative, indicating imaginary lines.
Correct Answer: B — Imaginary
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Q. The pair of lines represented by the equation x^2 - 4x + y^2 - 4y = 0 are:
A.
Parallel
B.
Perpendicular
C.
Coincident
D.
Intersecting
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Solution
Rearranging gives (x-2)^2 + (y-2)^2 = 0, which represents two intersecting lines.
Correct Answer: D — Intersecting
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Q. The pair of lines represented by the equation x^2 - 4x + y^2 - 6y + 8 = 0 are:
A.
Parallel
B.
Intersecting
C.
Coincident
D.
Perpendicular
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Solution
To determine the nature of the lines, we can rewrite the equation in the form of (x - a)^2 + (y - b)^2 = r^2 and analyze the discriminant.
Correct Answer: B — Intersecting
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Q. The pair of lines represented by the equation x^2 - 4x + y^2 - 6y + 9 = 0 are:
A.
Parallel
B.
Intersecting
C.
Coincident
D.
Perpendicular
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Solution
Rearranging gives (x-2)^2 + (y-3)^2 = 0, which represents a single point, hence the lines are coincident.
Correct Answer: B — Intersecting
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Q. The pair of lines represented by the equation x^2 - 4xy + 3y^2 = 0 are:
A.
Parallel
B.
Perpendicular
C.
Intersecting
D.
Coincident
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Solution
To determine the nature of the lines, we can find the slopes from the equation. The product of the slopes will help us conclude if they are perpendicular.
Correct Answer: B — Perpendicular
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Q. The pair of straight lines represented by the equation x^2 - 4xy + y^2 = 0 are:
A.
Parallel
B.
Perpendicular
C.
Coincident
D.
Intersecting at a point
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Solution
The given equation can be factored as (x - 2y)(x - 2y) = 0, indicating that the lines are perpendicular.
Correct Answer: B — Perpendicular
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Q. The slopes of the lines represented by the equation 2x^2 + 3xy + y^2 = 0 are:
A.
-1, -2
B.
1, 2
C.
-1, 1
D.
2, -2
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Solution
The slopes can be found by solving the quadratic equation derived from the given equation.
Correct Answer: A — -1, -2
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Q. The slopes of the lines represented by the equation 5x^2 + 6xy + 2y^2 = 0 are given by:
A.
-3/5 and -2/5
B.
2/5 and -5/2
C.
1/2 and -2
D.
None of the above
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Solution
Using the quadratic formula, the slopes are found to be -3/5 and -2/5.
Correct Answer: A — -3/5 and -2/5
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Q. The slopes of the lines represented by the equation 5x^2 + 6xy + 2y^2 = 0 are:
A.
-3/5, -2/5
B.
2/5, 3/5
C.
1, -1
D.
0, ∞
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Solution
The slopes can be calculated using the quadratic formula, yielding -3/5 and -2/5.
Correct Answer: A — -3/5, -2/5
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Q. What is the angle between the lines represented by the equation 2x^2 + 3xy - 2y^2 = 0?
A.
45 degrees
B.
60 degrees
C.
90 degrees
D.
30 degrees
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Solution
Using the formula for the angle between two lines, we find that the angle is 90 degrees.
Correct Answer: C — 90 degrees
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Q. What is the angle between the lines represented by the equation x^2 - 2xy + y^2 = 0?
A.
0 degrees
B.
45 degrees
C.
90 degrees
D.
135 degrees
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Solution
The angle can be calculated using the slopes derived from the equation, leading to 90 degrees.
Correct Answer: C — 90 degrees
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Q. What is the angle between the lines represented by the equation x^2 - 6x + y^2 - 8y + 9 = 0?
A.
0 degrees
B.
45 degrees
C.
90 degrees
D.
135 degrees
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Solution
By completing the square, we can find the slopes of the lines and calculate the angle between them.
Correct Answer: C — 90 degrees
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Q. What is the condition for the lines represented by ax^2 + 2hxy + by^2 = 0 to be parallel?
A.
h^2 = ab
B.
h^2 > ab
C.
h^2 < ab
D.
h^2 = 0
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Solution
The condition for the lines to be parallel is given by h^2 = ab.
Correct Answer: A — h^2 = ab
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Q. What is the condition for the lines represented by the equation 2x^2 + 3xy + y^2 = 0 to be coincident?
A.
D = 0
B.
D > 0
C.
D < 0
D.
D = 1
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Solution
The lines are coincident if the discriminant D of the quadratic equation is zero.
Correct Answer: A — D = 0
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Q. What is the condition for the lines represented by the equation 5x^2 + 4xy + 3y^2 = 0 to be parallel?
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Solution
The condition for parallel lines is that the determinant of the coefficients must be zero.
Correct Answer: C — 0
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Q. What is the slope of the lines represented by the equation 5x^2 - 10xy + 5y^2 = 0?
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Solution
The equation can be factored to find the slopes, which are both 1.
Correct Answer: A — 1
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Q. What is the slope of the lines represented by the equation x^2 - 6xy + 9y^2 = 0?
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Solution
Factoring gives (x - 3y)^2 = 0, indicating a double root, hence the slope is 3.
Correct Answer: A — 3
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