Correct Answer: Option C

Explanation

2y - ax + 4 = 0 \(\implies\) 2y = ax - 4.

y + (x/4) - 7 = 0 \(\implies\) y = -x/4 + 7

 Slope of line 1 = a/2

Slope of line 2 = -1/4

-1/4 x a/2 = -1 (product of the slope of two perpendicular lines = -1)

a/8 = 1 \(\implies\) a = 8.

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