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If the area of the triangle formed by the image of the first-order function passing through (- 2,0) and two coordinate axes is 2, the analytic expression of the first-order function can be obtained!
If the bottom of the triangle is 2 and the area is 2, the height is 2, so it also passes through (0,2) or (0, - 2)
Let y = KX + B
Substituting (- 2,0) (0,2), we get - 2K + B = 0, B = 2
k=1,b=2
y=x+2
Substituting (- 2,0) (0, - 2), we get - 2K + B = 0, B = - 2
k=-1,b=-2
y=-x-2
Who knows the formula of the distance between two points in the plane rectangular coordinate system?
We know the coordinates of two points in the plane rectangular coordinate system. How far is the distance between them? There should be a formula. Who knows what it is?
Under the root ((x1-x2) ^ 2 + (y1-y2) ^ 2), right?
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