Under x, it means that Y 1y2 is less than zero. The expression of Y 1Y2 just obtained is brought into the inequality where y 1 is less than 0 and Y2 is less than 0, and the value range of b is obtained by intersection. ..
Because point B and point C pass through the straight line y=kx+b, we can get the value of k b by bringing these two coordinates into this equation, that is, the resolution function.
The line where DE is located is translated from the line of CO, and the equation of OC is composed of C(- 1.3) and O(0.0). When these two coordinates are brought in, the equation of OC is y=-3x, because E(-2.0), ED EA shifts two units from the straight line y=-3x to the left, and the equation of DE is y =-3x+6. There seems to be a formula for finding the area by knowing the four-point coordinates. I'm working now, and I don't remember that much.
I hope it works for you!