exam Maths Puzzle Numerical Ability

if the slope of a line is undefined, then the line must be:
a.horizontal
b.vertical
c.diagonal
d.other
Which answer is correct?

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exam Other Question

Can someone help me on this problem? I put it through last night, but I typed in the equation wrong.

Which of the ordered pairs (3, 1), (0,-4), (-4, 0), (-3, -7)

are solutions for the equation x - y = 4?

Thanks,
Sher Can someone help me find the equivalent to the following equation? And do I subtract 29, or just part of it?

y = x2 - 8x + 29