When the slope of the straight line L exists, the point inclination angle Y2-Y 1 = K (X2-X 1),
When the straight line L has a non-zero intercept on two coordinate axes, there is an intercept formula X/a+y/b= 1.
For any point on any function, its slope is equal to the included angle between its tangent and the positive direction of X axis, that is, tanα.
Slope calculation: ax+by+c=0, where k =-a/b.
Linear slope formula: k=(y2-y 1)/(x2-x 1)
The product of slopes of two vertically intersecting lines is-1:k1* k2 =-1.
When k>0, the greater the angle between the straight line and the X axis, the greater the slope; When k < 0, the smaller the angle between the straight line and the X axis, the smaller the slope?
Extended data:
If the straight line is perpendicular to the X axis, then the tangent of the right angle is infinite, so the straight line has no slope. When the slope of the straight line L exists, for the linear function y=kx+b (oblique section), k is the slope of the function image (straight line).
The ratio I between the vertical height h and the horizontal width l of the slope is called the slope; If the included angle α between the slope and the horizontal plane is called the slope angle, then; The greater the slope.
The slope k is equal to the tangent of the inclination angle (only one) α of the corresponding straight line (there are countless parallel lines), which can reflect the inclination degree of this kind of straight line to the X axis. In fact, the concept of "slope" is consistent with the "slope" in engineering problems.
Baidu encyclopedia-slope of straight line