exam Maths Puzzle Numerical Ability

Triangle ABC is not isoceles. Prove that altitude BD would not bisect AC.

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Can someone help me with this one.
Determine whether the graphs of the equations are parallel lines, perpendicular lines or niether.
3x - 8y = -18
32x + 12y = -18
Thank you! Use the formula a(sub1) + a(sub1)r + a(sub1)r^2 + ... a(sub1)^n-1 =
a(sub1) 1-r^n/1-r for the nth partial sum of a geometric sequence to find the sum 1 + 2/3 + 4/9 + 8/27 + ... 64