exam Maths Puzzle Numerical Ability

Find the slope of the line passing through the points (1, 3) and (1, -1).
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exam Other Question

Parallelogram PQRS has PQ=RS=8cm, and diagonal QS=10cm. Point F is on RS, exactly 5cm from S. Let T be the intersection of PF and QS. Find the lengths of TS and TQ. I dont really understand the distributive property, can you explain it to me