exam Maths Puzzle Numerical Ability

Find the slope and y-intercept.
x = -7
is it:
(A) Slope: undefined; y-intercept: (0, -7)
(B) Slope: 0; y-intercept: none
(C) Slope: undefined; y-intercept: none
(D) Slope: 0; y-intercept: (0, -7)

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