1.

Linear equations are of __________ form.

A. ax<sup>2</sup>+bx+c = 0
B. ax+by+c = 0
C. x<sup>2</sup>+y<sup>2</sup> = a<sup>2</sup>
D. x<sup>2</sup>-y<sup>2</sup> = a<sup>2</sup>
Answer» C. x<sup>2</sup>+y<sup>2</sup> = a<sup>2</sup>


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