book Maths Puzzle Numerical Ability

Find s if the line joining (2,6) to (s+4,s) is parallel to the line joining (5,3) and (-2,0).

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book Other Question

Two years after an expansion, a company had sales of $42,000. Four years later the sales were $102,000. Assuming that the sales in dollars S and the time in years t are related by a linear equation, find the equation relating S and t. ONE HALF A NUMBER INCREASED BY SIX IS THE SAME NUMBER DECREASED BY FOUR. WHAT IS THE NUMBER?