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Creating a Line with a Positive Slope

A line passes through the point (0, -1) and has a positive slope. Which of these points could that line pass through?
Check all that apply.

A (12,3)
B (-2,-5)
C (-3, 1)
D (1, 15)
E (5,-2)

1 Answer

3 votes

Final Answer:

The line passing through (0, -1) and having a positive slope could pass through points (12,3), (-3, 1), and (1, 15). Thus the correct options are A, C and D.

Step-by-step explanation:

Given point:

(P(0, -1)

Equation of a line in point-slope form:

(y - y₁) = m(x - x₁), where (x₁, y₁) = (0, -1) and m represents the positive slope

Given positive slope:

Let's assume m = k (a positive value).

Now, let's test each point:

A (12, 3):

Substitute (x₁, y₁) = (0, -1) and the coordinates of point A into the point-slope equation:

3 - (-1) = k(12 - 0)

4 = 12k

k = 4/12 = 1/3

C (-3, 1):

Substitute (x₁, y₁) = (0, -1) and the coordinates of point C into the point-slope equation:

1 - (-1) = k(-3 - 0)

2 = -3k

k = 2/-3 = -2/3

D (1, 15):

Substitute (x₁, y₁) = (0, -1) and the coordinates of point D into the point-slope equation:

15 - (-1) = k(1 - 0)

16 = k

For points B (-2, -5) and E (5, -2), let's follow the same process:

B (-2, -5):

y - (-1) = k(-2 - 0)

-5 + 1 = -2k

-4 = -2k

k = -4/-2= 2

E (5, -2):

y - (-1) = k(5 - 0)

-2 + 1 = 5k

-1 = 5k

k = -1/5

From these calculations, the values of k for points A, C, and D are k = 1/3, k = -2/3, and k = 16 respectively. Only points A, C, and D result in positive or negative slopes as required, indicating that the line passing through the point (0, -1) with a positive slope can go through points A (12, 3), C (-3, 1), and D (1, 15).

Therefore, the correct options are A, C and D.

User Mojo
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