Question #500157

# HELP with a calculus problem dealing with tangent lines to a function!?

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consider the parabola y=x^2
a) show that the line through the point (3, -7) with a slope -2 is tangent to the parabola.
b) find another line through (3, -7) that is tangent to the parabola.
c) is there a third line through (3, -7) that is tangent to the parabola? justify your answer.
if you could show me step by step how to solve this problem that would be great!! thank you so much!
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TELL US , if you have any answer