When the image of Y equals KX passes through point A2. Minus one, the area of the triangle formed by the image of this function and the X axis is calculated

When the image of Y equals KX passes through point A2. Minus one, the area of the triangle formed by the image of this function and the X axis is calculated

y=kx
Substitution of a (2, - 1)
-1=2k
k=-1/2
I didn't tell you the range of X or the range of Y
The area of the definite triangle cannot be obtained