我搜索了很多網頁,但找不到具體而簡單的答案,所以我寫在這里并希望得到答案。我如何以圖形方式在 Octave 上求解這個方程?有系統:

clf;
x = (-5: 1: 5);
y = sqrt(29 - x.^2);
plot(x,y,'.-');
hold on
x = (-5: 1: 5);
y = sqrt(9 4*x.^2);
plot(x,y,'.-');
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