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if x4+y4+x2y2=21 and x2+y2-xy=7, then what is the value of $${x\over y}+{y\over x}=?$$
5Q:
if x4+y4+x2y2=21 and x2+y2-xy=7, then what is the value of $${x\over y}+{y\over x}=?$$
- 1$$15\over 8$$false
- 2$$3\over 2$$true
- 3$$27\over 28$$false
- 4$$3\over 4$$false
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