exam Maths Puzzle Numerical Ability

Find the slope of the line passing through the points (1, 3) and (1, -1).
-4
0
Undefined
1

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exam Other Question

Find real or imaginary solutions by using quadratic formula.
x square - x =6
A wedding cake meaures 2 feet high in the center and the diameter of the bottom tier is 12 inches. What is the slope of the cake?