If the points P1 (- 1,3) and P2 (1, b) are known, and p1p2 is parallel to the X axis, then B =?

B = 3, the value of Y at any point of the line parallel to the X axis is equal

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1. Given that a line L is parallel to the X axis, P1 (- 2,3) P2 (X2, Y2) is two points on the line L, and the distance between P1 and P2 is 4, then the coordinate of P2 is
2. According to the following conditions, find the distance P1 (0, - 2) P2 (3,0) p1 (- 3,1), P2 (2,4) p1 (4, - 2) P2 (1,2)
3. The expression of L1 and L2 is y = 3 / 4x + 3, y = 3 / 4x-3, then the distance between these two parallel lines is
4. If two straight lines ax-by + 4 = 0 and (A-1) x + y + B = 0 are parallel and the distance from the origin of the coordinate to the two straight lines is equal, find the straightness of a and B
5. If line L1: ax by + 4 = 0 and line L2: (A-1) x + y + B = 0 are parallel and the distance between the two lines at the origin is equal, find a and B Doesn't that mean the two lines coincide? I'm a / (A-1) = - B / 1 = 4 / b I see, but why can't I work out the answer by using the distance equality formula
6. If the moving points a (x1, Y1) and B (X2, Y2) move on the line L1: x + Y-7 = 0 and L2: x + Y-5 = 0 respectively, the minimum distance from the midpoint m of line AB to the origin is () A. 23B. 33C. 32D. 42
7. It is known that two straight lines L1: ax by + 4 = 0, L2: (A-1) x + y + B = 0. The line L1 is parallel to L2, and the distance from the origin of the coordinate to L1 and L2 is equal. The value of a and B can be obtained
8. 2.1×1.1×0.54÷（5.4×1.21÷521）=______ ．
9. How to use C + + program to judge whether a number is prime or not
10. Let C: x ^ 2 + y ^ 2 + 4x-6y = 0, if C is symmetric with respect to the line L: a * (x-2y) - (2-A) * (2x + 3y-4) = 0, find the value of real number a
11. Given P1 (2,5, - 6), find a point P2 on the Y axis so that | p1p2 | = 7
12. It is known that the distances from P1 (a-1,5), P2 (2, B-1) to X-axis are equal, and p1p2 is parallel to Y-axis to calculate the value of (a + b) to the power of 2012
13. It is known that the equation of circle C is x2 + y2-6x-2y + 5 = 0. The moving line L passing through point P (2,0) intersects with circle C at two points P1 and P2. Let P1 and P2 be tangent lines L1 and L2 of circle C respectively. Let the intersection of L1 and L2 be m. prove that point m is on a fixed line, and work out the equation of this fixed line
14. Given two points P1 (- 3,5) P2 (5, - 7), the equation of vertical bisector of line p1p2 is obtained Urgent need
15. The distance from point P (a, 3) to the line 4x-3y + 1 = 0 is equal to 4, and the inequality is 2x = y
16. Given that P is a point on the line 4x-y-1 = 0, the distance from P to the line 2x + y + 5 = 0 is equal to the distance from the origin to the line, then the coordinate of P is?
17. Given that the point P is on the straight line y = 2x + 3, and the distance from the point P to the origin is equal to twice the distance from the point P to the y-axis, find the coordinates of the point P
18. Point m is on the line y = 2x. If the distance from m to the origin is equal to the distance from m to the line x-2y + 8 = 0, find the coordinates of point M
19. If there are only two points on the circle C: (x-3) ^ 2 + (y + 5) ^ 2 = R ^ 2 and the distance from the two points to the straight line L: 4x-3y = 17 is 1, what is the value range of R?
20. Let (x + 3) * 2 + (y + 5) * 2 = R * 2 have only one point and the distance from the point to the line 4x-3y + 2 = o be 1, then the radius of the circle R is 1 Change only one point to only two points