Given two points a (- 1,2), B (m, 3) (1) find the slope k and inclination angle a of the straight line A. B; (2) find the equation of the straight line A. B

Given two points a (- 1,2), B (m, 3) (1) find the slope k and inclination angle a of the straight line A. B; (2) find the equation of the straight line A. B

(1) K = (3-2) / (M - (- 1)) = (3-2) / (M + 1) = 1 / (M + 1) does not exist when m = - 1, inclination angle = 90 degrees, k = 1 / (M + 1) when m 〉 - 1, inclination angle = arctan1 / (M + 1) when m 〉 - 1

Is, cup, this, is, no, not, it, your
Please help me.

Is this your cup? No it is not.

If the image of parabola y = ax * 2 and y = -- 2 / 3x * 2 is symmetric about X axis, then a =?
2, the parabola passes through points a (- 1,0), B (2,0), and the shape is the same as the parabola y = 2 / 3x * 2, then the vertex coordinate is? 3, the intersection of the parabola y = x * 2 = x * 2 -- 2x -- 1 and the X axis is (m, 0), then the algebraic formula m * 2 -- 2m -- 2009 =? 4, the vertex of the parabola y = x * 2 + 6x + C is on the X axis, then the vertex coordinate is? 2?

1. A = 2 / 3 2, let y = 2 / 3x ^ 2 + BX + C, and then bring two-point coordinates into solution 3, that is, there is only one intersection point between the function image and X axis, that is, B ^ 2-4ac = 0

Given a, B ∈ R, and | A-1 | + 4B & # 178; + 4B = - 1, then the value of A-B is

|a-1|+4b²+4b=-1
|a-1|+4b²+4b+1=0
|a-1|+（2b+1）²=0
a-1=0
a=1
2b+1=0
b=-1/2
a-b=1+1/2=3/2

Parameterize the ordinary equation and explain what the curve is
(1) X = cos ^ 2 * t and y = sin * t (t is a parameter) (2) x = (1-T ^ 2) / (1 + T ^ 2) and y = 2T / 1 + T ^ 2 (t is a parameter)

(1) The ordinary equation x + y2 = 1 is a parabola
(2) Let t = Tana be reduced to x = cos * 2A, y = sin * 2A, and the ordinary equation x ^ 2 + y ^ 2 = 1 is obtained
The curve is a circle

1.(2a+b²)-4a²
2. X4 (fourth power) - 3x-4

1.(2a+b²)-4a²
It can't be broken down
2. X4 (fourth power) - 3x-4
=x4-1-3x-3
=(x²+1)(x²-1)-3(x+1)
=(x²+1)(x+1)(x-1)-3(x+1)
=(x+1)[(x²+1)(x-1)-3]
=(x+1)(x³-x²+x-4)

If a, B and C are three points that are not on the same line, then draw a parallelogram with these three points as the vertex, and you can draw ()
A. One B. two C. three D. four

It is known that three points are a, B and C, which connect AB, BC and ca. ① AB is the diagonal of parallelogram, BC and Ca are the two sides, which can draw ▱ acbd; ② CB is the diagonal of parallelogram, Ba and Ca are the two sides, which can draw ▱ aceb; ③ CA is the diagonal of parallelogram, Ba and CB are the two sides, which can draw ▱ abcf; there are three parallelogram: ▱ acbd, ▱ aceb, ▱ abcf

The solution set of 2x-1 / 2-3x ≥ 4

2x-1 ≥ 8-12x 14x ≥ 9 x ≥ 9 / 14

The parabola y = x & sup2; is first translated down two unit lengths and rotated 180 degrees around its vertex

The two units of downward translation are y = x & sup2; - 2
After rotation, y = - X & sup2; - 2

Explanation of bivariate linear equation
That's to say, what's two yuan at a time,
Be refined, not too long

Binary linear equation means that there are two unknowns in the integral equation, and the highest degree of the letter is 1
The central idea of solving bivariate linear equation is elimination