book Maths Puzzle Numerical Ability

Write the letter corresponding to the equation of the line with x-intercept (-9, 0) and undefined slope.

A) y = -9x

B) y = -9

C) x = 0

D) x = -9

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book Other Question

how many diagonals are in a 21-gon? x^3+x^2+ sqrt(x^2+3x)=6

I've tried to square both sides, I've tried setting the equation equal to 0, I've tried to factor out x^2+x, I'm just at a loss.

Thanks for your help!