The solar electric generating systems at Kramer Junction,California,use parabolic troughs to heat a heat-transfer fluid to a high temperature.This fluid is used to generate steam that drives a power conversion system to produce electricity. For troughs 7.5 feet wide, an equation for the cross-section is   16y2=12x-225.                                                                                                                 .  (a) Find the intercepts of the graph of the equation. (b) Test for symmetry with respect to the x-axis,y-axis,and origin.

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