book Maths Puzzle Numerical Ability

4s-12=-5s+51

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4x + 3y = 4 find linear equation, then find the slope and the y intercept of the line with this equation Dave Salcedo has $40,000 to invest. He invests part of it at 5%, one-fourth of this amount at 6%, and the rest of the money at 7%. His total annual interest income is $2,530. Fin