exam Maths Puzzle Numerical Ability

Find the slope and y-intercept.
5x - 7y = 70

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exam Other Question

A broker invested some money at 7.5% interest,and a thousand dollars less at 6% annual interest. After one year she earned $1087.50 in interest. How much money was invested at each Will you please answer my question:-7/4a+1/2=-9/10