book Maths Puzzle Numerical Ability

a university association invested part of $20,000 in preferred stock that earns 8% annual simple interest and the remainder in a municipal bond earns 7% annual simple interest. Th

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Hi, i need some help on idenifying the slope and y-intercept of the line.
One problem is: 3x - y = 12

Thanks for your time. At a local high school, the ratio of boys to girls is 3:4. there are 1200 boys in the school. how many girls are there?