exam Maths Puzzle Numerical Ability

1. Given: AC=BD
Prove: AB=CD

2. Given: 2(MLRPQ)=MLSPQ
Prove: LRPQ=LSPR

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exam Other Question

I need the y= mx+b equations for these lines:

Line 1: -8x+13y+1 = 0
Line 2: -12x+11y+27 = 0

Thanks gang Find the mean and the median.
-6, -3, 1, 5, 9, 18