exam Maths Puzzle Numerical Ability

Could you please help me solve and understand this equation?

Find an equation of the line containing the given pairs of points
(4,3) and (12,7) Y=

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exam Other Question

Christine inherits $10,000. She invests part in a CD that makes 15% per year and the rest in a bond that made 7% per year. Her total profit after two years is $2,600. How much d 49m2-9=0