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Find the equation of a line.
1. parallel to y = 3x + 4, passing through P1(-2, 5)
2. parallel to a line passing P1(0, -3) and P2(-1, 4) and passing through P3(-1, 4).
3. perpendicular to the line y = x + 4 and passing through (-2, -6).
4. perpendicular to the line passing through point P1(3, 2) , P2(4, -6), and passing through P3(-6, 4).

2 Answers

+1 vote
by (160 points)

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+1 vote
by (20.0k points)

Sure, I can help you with that. Here are the equations of the lines you requested:

1. Since the line is parallel to y = 3x + 4, it has the same slope of 3. Using a point-slope form, the equation of the line passing through P1(-2, 5) is:

y - 5 = 3(x + 2)

y - 5 = 3x + 6

y = 3x + 11

Therefore, the equation of the line is y = 3x + 11.


2. Since the line is parallel to the line passing through P1(0, -3) and P2(-1, 4), it has the same slope as that line. The slope of the line passing through P1(0, -3) and P2(-1, 4) is:

slope = (4 - (-3)) / (-1 - 0) = 7 / (-1) = -7

Using a point-slope form, the equation of the line passing through P3(-1, 4) is:

y - 4 = -7(x + 1)

y - 4 = -7x - 7

y = -7x - 3

Therefore, the equation of the line is y = -7x - 3.


3. Since the line is perpendicular to the line y = x + 4, its slope is the negative reciprocal of the slope of y = x + 4, which is -1. Using a point-slope form, the equation of the line passing through (-2, -6) is:

y - (-6) = -1(x - (-2))

y + 6 = -x - 2

y = -x - 8

Therefore, the equation of the line is y = -x - 8.


4. Since the line is perpendicular to the line passing through points P1(3, 2) and P2(4, -6), its slope is the negative reciprocal of the slope of that line. The slope of the line passing through P1(3, 2) and P2(4, -6) is:

slope = (-6 - 2) / (4 - 3) = -8

The negative reciprocal of -8 is 1/8, so the slope of the line we're looking for is 1/8. Using a point-slope form, the equation of the line passing through P3(-6, 4) is:

y - 4 = (1/8)(x - (-6))

y - 4 = (1/8)x + 3/4

y = (1/8)x + 19/4

Therefore, the equation of the line is y = (1/8)x + 19/4.

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