How can you distinguish parabolas from other conic sections by looking at their equations without an 𝑥𝑦−term?Group of answer choicesIn equations for parabolas, 𝑥 and 𝑦 are both squared and the coefficients on them are the same, including the sign.In equations for parabolas, 𝑥 and 𝑦 are both squared, and exactly one of the coefficients is negative and exactly one of the coefficients is positive.In equations for parabolas, 𝑥 and 𝑦 are both squared, and the coefficients are positive but different.In equations for parabolas, either 𝑥 and 𝑦 is squared, but not both.
Question
How can you distinguish parabolas from other conic sections by looking at their equations without an 𝑥𝑦−term?Group of answer choicesIn equations for parabolas, 𝑥 and 𝑦 are both squared and the coefficients on them are the same, including the sign.In equations for parabolas, 𝑥 and 𝑦 are both squared, and exactly one of the coefficients is negative and exactly one of the coefficients is positive.In equations for parabolas, 𝑥 and 𝑦 are both squared, and the coefficients are positive but different.In equations for parabolas, either 𝑥 and 𝑦 is squared, but not both.
Solution
In equations for parabolas, either 𝑥 or 𝑦 is squared, but not both. This is what distinguishes parabolas from other conic sections when looking at their equations without an 𝑥𝑦-term.
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