✔ 最佳答案
x^2/(169/9) + y^2/(169/25) = 1
this is an ellipse with center at (0,0) ... the possible x-values are from -13/3 to 13/3 ... the possible y-values are from -13/5 to 13/5
x^2 + 28x + 196 + y^2 - 23y + 529/4 = 152 + 196 + 529/4 = 340.25
this is a circle with center at (-14 , 11.5) with radius...18.44.
it turns out that the ellipse is totally inside the circle...
there will be one intersection if their tangent values at the point are the same...
for ellipse... 9x + 25y dy/dx = 0 ... dy/dx = -36/25
for circle .. 2x + 2y dy/dx + 28 - 23 dy/dx = 0
dy/dx = -(2x+28)/(23 - 2y) = -36/25
§