Coordinate Geometry - Straight Lines

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Q1. Which of the following represents the inequality x + 3 > 7?

Solution:

Subtract 3 from both sides: x > 7 - 3.\nThus, x > 4.

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Q2. Which of the following lines is parallel to the line y = -1/2x + 3?

Solution:

Parallel lines have the same slope.\nThe slope of the given line is -1/2, so a parallel line must also have a slope of -1/2.

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Q3. Which of the following represents the inequality x + 3 > 5?

Solution:

To solve x + 3 > 5, subtract 3 from both sides.\n1. x > 2.

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Q4. What is the solution set for the equation 2x + 3 = 7?

Solution:

Subtract 3 from both sides: 2x = 4.\nThen divide by 2: x = 2.

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Q5. Which of the following is the correct factored form of the quadratic x^2 - 5x + 6?

Solution:

To factor, find two numbers that multiply to 6 and add to -5.\nThe numbers are -2 and -3.\nThus, the factored form is (x - 2)(x - 3).

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Q6. What is the equation of the line that passes through the points (1, 2) and (3, 6)?

Solution:

Calculate the slope: m = (y2 - y1)/(x2 - x1) = (6 - 2)/(3 - 1) = 2.\nUsing point-slope form: y - 2 = 2(x - 1) gives y = 2x.

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Q7. What is the y-intercept of the line given by the equation 3x + 2y = 6?

Solution:

Convert to slope-intercept form (y = mx + b).\n1. 2y = -3x + 6\n2. y = -1.5x + 3.\nThe y-intercept is 3.

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Q8. What is the equation of the line perpendicular to y = 3x + 1 that passes through the point (2, 5)?

Solution:

The slope of the given line is 3.\nThe slope of the perpendicular line is -1/3.\nUsing point-slope form: y - 5 = -1/3(x - 2) gives y = -1/3x + 7.

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Q9. Which of the following is the standard form of the equation of a line with slope 5 and y-intercept -3?

Solution:

The slope-intercept form is y = mx + b.\n1. y = 5x - 3 can be rearranged to 5x - y = 3.\nThus, the standard form is 5x - y = 3.

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Q10. If the line 2x + 3y = 12 is transformed to slope-intercept form, what is the slope?

Solution:

Convert to slope-intercept form (y = mx + b).\n1. 3y = -2x + 12\n2. y = -2/3x + 4.\nThe slope is -2/3.