The slope of the line passing through the points (2,-1) and (x,5) is -1. Find x?

The slope of the line passing through the points (2,-1) and (x,5) is -1. Find x?
1). 4
2). -4
3). -8
4). 8

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Other Questions

1. What is the slope of the line perpendicular to the line passing through the points (4,5) and (3,2)?

2. If 2x - 2(4 - x) < 2x - 3 < 3x + 3; then x can take which of the following values?

3. What is the equation of the line if its slope is 1/4 and yintercept is 3?

4. What are the co-ordinates of the centroid of a triangle, whose vertices are A(1, -5), B(-4, 0) and C(3, -4)?

5. What is the equation of the line whose yintercept is -3 and makes an angle of 45° with the positive x-axis?

6. The point R(a,b) is first reflected in origin to R1 and R1 is reflected in X-axis to (-5,1). The co-ordinates of point R are?

7. What is the slope of the line 4x - 8y = 3?

8. The slopes of two lines are 1/√3 and √3. What is the angle between these two lines?

9. What are the co­ordinates of the centroid of a triangle, whose vertices are A(-­2,-­5), B(4,-­4) and C(7,3)?

10. Reflection of the point (4,-5) in the y-axis is